1
|
Xu Y, Mohyeldin A, Lee CK, Nunez MA, Mao Y, Cohen-Gadol AA, Fernandez-Miranda JC. Endoscopic Endonasal Approach to the Ventral Petroclival Fissure: Anatomical Findings and Surgical Techniques. J Neurol Surg B Skull Base 2024; 85:420-430. [PMID: 38966292 PMCID: PMC11221900 DOI: 10.1055/a-2088-3086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 05/03/2023] [Indexed: 07/06/2024] Open
Abstract
Objective The endoscopic endonasal approach has emerged as an excellent option for the treatment of lesions involving the petroclival fissure (PCF). Here, we investigate the surgical anatomy of the ventral PCF and its application in endoscopic endonasal surgery. Methods Sixteen head specimens were used to investigate the anatomical features of PCF and relevant technical nuances in translacerum, extreme medial, and contralateral transmaxillary (CTM) approaches. Two representative endoscopic endonasal surgeries involving the PCF were selected to illustrate the clinical application. Results From the endoscopic endonasal view, the ventral PCF is presented as a lazy L sign, which is divided into two distinct segments: (1) upper (or petrosphenoidal) segment, which extends vertically from the foramen lacerum inferiorly to the junction of the petrosal process of sphenoid bone and petrous apex superiorly, and (2) lower (or petroclival) segment, which extends inferolaterally from the foramen lacerum to the ventral jugular foramen. Approaching both segments of the ventral PCF first requires full exposure of the foramen lacerum, followed either by exposure of the anterior wall of cavernous sinus and paraclival internal carotid artery for upper segment access, or transection of pterygosphenoidal fissure and Eustachian tube mobilization for lower segment access. Combined with a CTM approach, the lateral extension of the surgical access can be improved for both upper and lower segment PCF approaches. Conclusion This study provides a detailed investigation of the microsurgical anatomy of the ventral part of PCF, relevant surgical approaches, and technical nuances that may facilitate its safe exposure intraoperatively.
Collapse
Affiliation(s)
- Yuanzhi Xu
- Department of Neurosurgery, Stanford Hospital, Stanford, California, United States
- Department of Neurosurgery, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Ahmed Mohyeldin
- Department of Neurological Surgery, University of California, Irvine, California, United States
| | - Christine K. Lee
- Department of Neurosurgery, Stanford Hospital, Stanford, California, United States
| | | | - Ying Mao
- Department of Neurosurgery, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Aaron A. Cohen-Gadol
- The Neurosurgical Atlas, Carmel, Indiana, United States
- Department of Neurological Surgery, Indiana University, Indianapolis, Indiana, United States
| | - Juan C. Fernandez-Miranda
- Department of Neurosurgery, Stanford Hospital, Stanford, California, United States
- The Neurosurgical Atlas, Carmel, Indiana, United States
| |
Collapse
|
2
|
Awyono S, Takeuchi K, Ito E, Nagata Y, Golden N, Mahadewa TGB, Saito R. Case report: Endoscopic endonasal transposterior clinoid approach for resection of posterior clinoid process meningioma: technical notes and literature review. Front Oncol 2024; 14:1368277. [PMID: 38919531 PMCID: PMC11196407 DOI: 10.3389/fonc.2024.1368277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 03/25/2024] [Indexed: 06/27/2024] Open
Abstract
Background Posterior clinoid process (PCP) meningioma is an exceedingly rare entity. It remains the most challenging skull base lesion for neurosurgeons due to its treacherous location that insinuates amongst critical neurovascular structures. This article will describe the technical notes using the endoscopic endonasal approach that provide the earliest devascularization and detachment of the tumor PCP meningioma. Methods We are introducing the surgical implementation of an endoscopic endonasal approach to removing PCP meningioma. Furthermore, we perform a literature review of posterior clinoid process meningioma that undergoes surgical intervention, then summarize the benefits and limitations of each approach. Results We present a case of right PCP meningioma that was removed using an endoscopic endonasal approach through the transposterior clinoid corridor in a 52-year-old-woman. We describe the technical notes in performing this approach to have the earliest devascularization and detachment of the tumor by performing posterior clinoidectomy. Safe tumor removal is performed with a wide and clear view of the surrounding neurovascular structure. Based on our database search, we found nine articles reported on the surgical management of PCP meningiomas, with a total number of 15 cases. All of the reported cases performed the tumor removal using the transcranial approach. Conclusion The endoscopic endonasal transposterior clinoid approach circumvents all disadvantages faced by the traditional transcranial approach, providing the earliest approach to devascularized and detaching the tumor from its attachment at PCP. This approach demonstrates safety and efficacy, making it an acceptable alternative for PCP meningioma resections.
Collapse
Affiliation(s)
- Steven Awyono
- Neurosurgery Division, Department of Surgery, Faculty of Medicine, Udayana University, Prof. Dr. I.G.N.G. Ngoerah General Hospital, Bali, Indonesia
- Department of Neurosurgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kazuhito Takeuchi
- Department of Neurosurgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Eiji Ito
- Department of Neurosurgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yuichi Nagata
- Department of Neurosurgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Nyoman Golden
- Neurosurgery Division, Department of Surgery, Faculty of Medicine, Udayana University, Prof. Dr. I.G.N.G. Ngoerah General Hospital, Bali, Indonesia
| | - Tjokorda Gde Bagus Mahadewa
- Neurosurgery Division, Department of Surgery, Faculty of Medicine, Udayana University, Prof. Dr. I.G.N.G. Ngoerah General Hospital, Bali, Indonesia
| | - Ryuta Saito
- Department of Neurosurgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| |
Collapse
|
3
|
Karadag A, Yuncu ME, Middlebrooks EH, Tanriover N. Endoscopic trans-eustachian tube approach: identifying the precise landmarks, a novel radiological and anatomical evaluation. Surg Radiol Anat 2024; 46:625-634. [PMID: 38530385 DOI: 10.1007/s00276-024-03344-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 03/08/2024] [Indexed: 03/28/2024]
Abstract
PURPOSE The endoscopic trans-eustachian approach (ETETA) is a less invasive approach to the infratemporal fossa (ITF), providing superior exposure compared to traditional transcranial approaches. The anatomy of the pharyngotympanic (eustachian) tube and adjacent neurovascular structures is complex and requires in-depth knowledge to safely perform this approach. We present a cadaveric and radiological assessment of critical anatomic considerations for ETETA. METHODS Six adult cadaveric heads were dissected alongside examination of 50 paranasal sinus CT scans. Key anatomic relationships of the pharyngotympanic tube and adjacent structures were qualitatively and quantitatively evaluated. Descriptive statistics were performed for quantitative data. RESULTS Anatomical and radiological measurements showed lateralization of the pharyngotympanic tube allows access to the ITF. The pharyngotympanic tube has bony and cartilaginous parts with the junction formed by the sphenoid spine and foramen spinosum. The bony part and tendon of the tensor tympani muscle were located at the posterior genu of the internal carotid artery. The anterior and inferior wall of the carotid canal was located between the horizontal segment of the internal carotid artery and petrous segment of the cartilaginous pharyngotympanic tube. CONCLUSION The combination of preoperative radiographic assessment and anatomical correlation demonstrates a safe and effective approach to ETETA, which allowed satisfactory visualization of ITF. The morphological evaluation showed that the lateralization of the pharyngotympanic tube and related structures allowed a surgical corridor to reach the ITF. Endoscopic surgery through the pharyngotympanic tube is challenging, and in-depth understanding of the key anatomic relationships is critical for performing this approach.
Collapse
Affiliation(s)
- Ali Karadag
- Izmir Faculty of Medicine, Department of Neurosurgery, University of Health Sciences, Izmir, Turkey.
- Department of Neurosurgery, Izmir City Hospital, Laka, Bornova / Izmir, 35040, Turkey.
| | - Mustafa Eren Yuncu
- Department of Neurosurgery, Izmir City Hospital, Laka, Bornova / Izmir, 35040, Turkey
| | - Erik H Middlebrooks
- Department of Neurosurgery, Mayo Clinic, Jacksonville, FL, USA
- Department of Radiology, Mayo Clinic, Jacksonville, FL, USA
| | - Necmettin Tanriover
- Cerrahpasa Faculty of Medicine, Department of Neurosurgery, Istanbul University - Cerrahpasa, Istanbul, Turkey
- Cerrahpasa Faculty of Medicine, Department of Neurosurgery, Microsurgical Neuroanatomy Laboratory, Istanbul University - Cerrahpasa, Istanbul, Turkey
| |
Collapse
|
4
|
Abouammo MD, Narayanan MS, Alsavaf MB, Alwabili M, Gosal JS, Bhuskute GS, Wu KC, Jawad BA, VanKoevering KK, Carrau RL, Prevedello DM. Contralateral Nasofrontal Trephination: A Novel Corridor for a "Dual Port" Approach to the Petrous Apex. Oper Neurosurg (Hagerstown) 2024:01787389-990000000-01097. [PMID: 38506519 DOI: 10.1227/ons.0000000000001119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Accepted: 01/13/2024] [Indexed: 03/21/2024] Open
Abstract
BACKGROUND AND OBJECTIVES Expanded endonasal approaches (EEAs) have proven safe and effective in treating select petrous apex (PA) pathologies. Angled endoscopes and instruments have expanded indications for such approaches; however, the complex neurovascular anatomy surrounding the petrous region remains a significant challenge. This study evaluates the feasibility, anatomic aspects, and limitations of a contralateral nasofrontal trephination (CNT) route as a complementary corridor improving access to the PA. METHODS Expanded endonasal and CNT approaches to the PA were carried out bilaterally in 15 cadaveric heads with endovascular latex injections. The distance to the PA, angle between instruments through the 2 approach portals, and surgical freedom were measured and compared. RESULTS Three-dimensional DICOM-based modeling and visualization indicate that the CNT route reduces the distance to the target located within the contralateral PA by an average of 3.33 cm (19%) and affords a significant increase in the angle between instruments (15.60°; 54%). Furthermore, the vertical vector of approach is improved by 28.97° yielding a caudal reach advantage of 2 cm. The area of surgical freedom afforded by 3 different approaches (endonasal, endonasal with an endoscope in CNT portal, and endonasal with an instrument in CNT portal) was compared at 4 points: the dural exit point of the 6th cranial nerve, jugular foramen, foramen lacerum, and petroclival fissure. The mean area of surgical freedom provided by both approaches incorporating the CNT corridor was superior to EEA alone at each of the surgical targets (P = <.001). CONCLUSION The addition of a CNT portal provides an additional avenue to expand on the classical EEA to the PA. This study provides insight into the anatomic nuances and potential clinical benefits of a dual-port approach to the PA.
Collapse
Affiliation(s)
- Moataz D Abouammo
- Department of Otorhinolaryngology-Head and Neck Surgery, Tanta University, Tanta, Egypt
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Maithrea S Narayanan
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Otolaryngology, Hospital Raja Permaisuri Bainun, Ipoh, Perak, Malaysia
| | - Mohammad Bilal Alsavaf
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Neurological Surgery, The Ohio State University Wexner Medical Center and James Cancer Hospital, Columbus, Ohio, USA
| | - Mohammed Alwabili
- Department of Otorhinolaryngology-Head and Neck Surgery, Prince Sultan Military Medical City, Riyadh, Saudi Arabia
| | - Jaskaran Singh Gosal
- Department of Neurosurgery, All India Institute of Medical Sciences (AIIMS), Jodhpur, Rajasthan, India
| | - Govind S Bhuskute
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Otolaryngology, All India Institute of Medical Sciences (AIIMS), Patna, Bihar, India
| | - Kyle C Wu
- Department of Neurological Surgery, The Ohio State University Wexner Medical Center and James Cancer Hospital, Columbus, Ohio, USA
| | - Basit A Jawad
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Kyle K VanKoevering
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Ricardo L Carrau
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Neurological Surgery, The Ohio State University Wexner Medical Center and James Cancer Hospital, Columbus, Ohio, USA
| | - Daniel M Prevedello
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Neurological Surgery, The Ohio State University Wexner Medical Center and James Cancer Hospital, Columbus, Ohio, USA
| |
Collapse
|
5
|
Xu Y, Asmaro K, Mohyeldin A, Zhang M, Nunez MA, Mao Y, Cohen-Gadol AA, Fernandez-Miranda JC. The Pterygosphenoidal Triangle: Surgical Anatomy and Case Series in Endoscopic Endonasal Skull Base Surgery. Oper Neurosurg (Hagerstown) 2023; 24:619-629. [PMID: 37071748 DOI: 10.1227/ons.0000000000000627] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 11/15/2022] [Indexed: 04/20/2023] Open
Abstract
BACKGROUND Safe exposure of the lacerum segment of the carotid artery remains a challenge in endoscopic endonasal surgery. OBJECTIVE To introduce the pterygosphenoidal triangle as a novel and reliable landmark for facilitating access to the foramen lacerum. METHODS Fifteen colored silicone-injected anatomic specimens were dissected using an endoscopic endonasal approach to the foramen lacerum region in a stepwise manner. Twelve dried skulls were studied and 30 high-resolution computed tomography scans were analyzed to measure the borders and angles of the pterygosphenoidal triangle. Surgical cases incorporating the foramen lacerum exposure between July 2018 and December 2021 were reviewed to provide surgical outcomes of the proposed surgical technique. RESULTS The pterygosphenoidal triangle is delineated by the pterygosphenoidal fissure medially and the vidian nerve laterally. The palatovaginal artery is located at the base of the triangle anteriorly, while the apex is formed by the pterygoid tubercle posteriorly, which leads to the anterior wall of the foramen lacerum and lacerum internal carotid artery. In the reviewed surgical cases, 39 patients underwent 46 foramen lacerum approaches for resection of pituitary adenoma (12 patients), meningioma (6 patients), chondrosarcoma (5 patients), chordoma (5 patients), or other lesions (11 patients). There were no carotid injuries or ischemic events. Near-total resection was achieved in 33 (85%) of 39 patients (gross-total in 20 [51%]). CONCLUSION This study details the pterygosphenoidal triangle as a novel and practical anatomic surgical landmark for safe and effective exposure of the foramen lacerum in endoscopic endonasal surgery.
Collapse
Affiliation(s)
- Yuanzhi Xu
- Department of Neurosurgery, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- Department of Neurosurgery, Stanford Hospital, Stanford, California, USA
| | - Karam Asmaro
- Department of Neurosurgery, Stanford Hospital, Stanford, California, USA
| | - Ahmed Mohyeldin
- Department of Neurosurgery, Stanford Hospital, Stanford, California, USA
| | - Michael Zhang
- Department of Neurosurgery, Stanford Hospital, Stanford, California, USA
| | - Maximiliano Alberto Nunez
- Department of Neurosurgery, Stanford Hospital, Stanford, California, USA
- Department of Neurosurgery, Hospital El Cruce, Buenos Aires, Argentina, USA
| | - Ying Mao
- Department of Neurosurgery, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Aaron A Cohen-Gadol
- Department of Neurological Surgery, Indiana University, Indianapolis, Indiana, USA
- The Neurosurgical Atlas, Carmel, Indiana, USA
| | - Juan C Fernandez-Miranda
- Department of Neurosurgery, Stanford Hospital, Stanford, California, USA
- The Neurosurgical Atlas, Carmel, Indiana, USA
| |
Collapse
|
6
|
Corvino S, Guizzardi G, Sacco M, Corrivetti F, Bove I, Enseñat J, Colamaria A, Prats-Galino A, Solari D, Cavallo LM, Di Somma A, de Notaris M. The feasibility of three port endonasal, transorbital, and sublabial approach to the petroclival region: neurosurgical audit and multiportal anatomic quantitative investigation. Acta Neurochir (Wien) 2023:10.1007/s00701-023-05498-6. [PMID: 36752892 DOI: 10.1007/s00701-023-05498-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 01/02/2023] [Indexed: 02/09/2023]
Abstract
PURPOSE The petroclival region represents the "Achille's heel" for the neurosurgeons. Many ventral endoscopic routes to this region, mainly performed as isolated, have been described. The aim of the present study is to verify the feasibility of a modular, combined, multiportal approach to the petroclival region to overcome the limits of a single approach, in terms of exposure and working areas, brain retraction and manipulation of neurovascular structures. METHODS Four cadaver heads (8 sides) underwent endoscopic endonasal transclival, transorbital superior eyelid and contralateral sublabial transmaxillary-Caldwell-Luc approaches, to the petroclival region. CT scans were obtained before and after each approach to rigorously separate the contribution of each osteotomy and subsequentially to build a comprehensive 3D model of the progressively enlarged working area after each step. RESULTS The addition of the contralateral transmaxillary and transorbital corridors to the extended endoscopic endonasal transclival in a combined multiportal approach provides complementary paramedian trajectories to overcome the natural barrier represented by the parasellar and paraclival segments of the internal carotid artery, resulting in significantly greater area of exposure than a pure endonasal midline route (8,77 cm2 and 11,14 cm2 vs 4,68 cm2 and 5,83cm2, extradural and intradural, respectively). CONCLUSION The use of different endoscopic "head-on" trajectories can be combined in a wider multiportal extended approach to improve the ventral route to the most inaccessible petroclival regions. Finally, by combining these approaches and reiterating the importance of multiportal strategy, we quantitatively demonstrate the possibility to reach "far away" paramedian petroclival targets while preserving the neurovascular structures.
Collapse
Affiliation(s)
- Sergio Corvino
- Division of Neurosurgery, Department of Neurosciences and Reproductive and Odontostomatological Sciences, Università Degli Studi Di Napoli Federico II, Naples, Italy
| | - Giulia Guizzardi
- Laboratory of Surgical Neuroanatomy, Faculty of Medicine, Universitat de Barcelona, Barcelona, Spain
| | - Matteo Sacco
- Department of Neurosurgery, "Riuniti" Hospital, Foggia, Italy
| | - Francesco Corrivetti
- Department of Neurosurgery, San Luca Hospital, Vallo Della Lucania, Salerno, Italy.,Laboratory of Neuroscience, EBRIS Foundation, European Biomedical Research Institute of Salerno, Salerno, Italy
| | - Ilaria Bove
- Division of Neurosurgery, Department of Neurosciences and Reproductive and Odontostomatological Sciences, Università Degli Studi Di Napoli Federico II, Naples, Italy
| | - Joaquim Enseñat
- Departments of Neurological Surgery, Hospital Clínic de Barcelona, Barcelona, Spain
| | | | - Alberto Prats-Galino
- Laboratory of Surgical Neuroanatomy, Faculty of Medicine, Universitat de Barcelona, Barcelona, Spain
| | - Domenico Solari
- Division of Neurosurgery, Department of Neurosciences and Reproductive and Odontostomatological Sciences, Università Degli Studi Di Napoli Federico II, Naples, Italy
| | - Luigi Maria Cavallo
- Division of Neurosurgery, Department of Neurosciences and Reproductive and Odontostomatological Sciences, Università Degli Studi Di Napoli Federico II, Naples, Italy
| | - Alberto Di Somma
- Laboratory of Surgical Neuroanatomy, Faculty of Medicine, Universitat de Barcelona, Barcelona, Spain. .,Departments of Neurological Surgery, Hospital Clínic de Barcelona, Barcelona, Spain.
| | - Matteo de Notaris
- Laboratory of Neuroscience, EBRIS Foundation, European Biomedical Research Institute of Salerno, Salerno, Italy.,Neurosurgery Operative Unit, Department of Neuroscience, "San Pio" Hospital, Benevento, Italy
| |
Collapse
|
7
|
Kikuchi M, Nakagawa T. Recent progress in endoscopic skull base surgery: Functional preservation and multiportal approaches. Auris Nasus Larynx 2023; 50:32-39. [PMID: 35440399 DOI: 10.1016/j.anl.2022.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/25/2022] [Accepted: 04/04/2022] [Indexed: 01/28/2023]
Abstract
Over the past couple of decades, endoscopic skull base surgery (ESBS) has significantly evolved and is applied to a broad range of skull base pathologies, including sinonasal malignancies. Recent studies have demonstrated remarkable progress of ESBS in complete resection with low morbidity and extension of its application to larger and more complex lesions. In this review, we focus on the evolution of functional preservation and multiportal approaches. Progress in preoperative assessments and surgical techniques improved the preservation of olfactory function after ESBS. The technical feasibility of olfaction preservation even after resection of olfactory groove lesions has been reported. To overcome the limitations of extending use of the endoscopic endonasal approach in surgical fields, various types of multiportal approaches, including combinations of the endoscopic endonasal and transorbital, transmaxillary, or transoral approach, have been reported, as they are useful for complete resection of extensive pathologies while limiting morbidity. These innovative techniques are still in the process of maturation. Hence, an ongoing critical evaluation is essential to ensure efficacy.
Collapse
Affiliation(s)
- Masahiro Kikuchi
- Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine, Kyoto University, 54 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan
| | - Takayuki Nakagawa
- Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine, Kyoto University, 54 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan.
| |
Collapse
|
8
|
Hara T, Mahmoud MS, Martinez-Perez R, McGahan BG, Hardesty DA, Albonette-Felicio T, Carrau RL, Prevedello DM. Morphometric comparison of Fisch type A and endoscopic endonasal far-medial supracondylar approaches to the jugular foramen. J Neurosurg 2022; 137:1124-1134. [PMID: 35061978 DOI: 10.3171/2021.11.jns212065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Accepted: 11/08/2021] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The jugular foramen (JF) is one of the most complex and challenging skull base regions to approach surgically. The extreme medial approach to access the JF provides the approach angle from an anterior direction and does not require dissection and sacrifice of the jugular bulb (JB) to reach the pars nervosa. The authors compared the Fisch type A approach to the extreme medial approach to access the JF and evaluated the usefulness of the extreme medial approach. METHODS This study was performed at the Anatomical Laboratory for Visuospatial Innovations in Otolaryngology and Neurosurgery of The Ohio State University. For the comparison of surgical maneuverability and visualization, two angles were measured: 1) the angle of attack (AoA), defined as the widest angle of movement achieved with a straight dissector; and 2) the angle of endoscopic exposure (AoEE), defined as the widest angle of movement in the nasal cavity. The differences in eustachian tube (ET) management, approach angle, surgical maneuverability, and surgical application of the Fisch type A approach to the extreme medial approach were compared. RESULTS There was no difference between ET mobilization and transection regarding cranial-caudal (CC) or medial-lateral (ML) AoA (p = 0.646). The CC-AoA of the Fisch type A approach was significantly wider than the CC-AoA of the extreme medial approach (p = 0.001), and the CC-AoEE was significantly wider than the CC-AoA of the extreme medial approach (p < 0.001). There was no significant difference between the CC-AoA of the Fisch type A approach and the CC-AoEE. The ML-AoA of the Fisch type A approach was significantly wider than the ML-AoA of the extreme medial approach (p = 0.033), and the ML-AoEE was significantly wider than ML-AoA in the extreme medial approach (p < 0.001). The ML-AoEE was significantly wider than the ML-AoA in the Fisch type A approach (p = 0.033). CONCLUSIONS The surgical maneuverability of the extreme medial approach was not inferior to that of the Fisch type A approach. The extreme medial approach can provide excellent surgical field visualization, while preserving the JB. Select cases of chordomas, chondrosarcomas, and JF schwannomas should be considered for an extreme medial approach. These two approaches are complementary, and a case-by-case detailed analysis should be conducted to decide the best approach.
Collapse
Affiliation(s)
- Takuma Hara
- 1Department of Neurological Surgery, and
- 3Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Mohammad Salah Mahmoud
- 2Otolaryngology-Head and Neck Surgery, Wexner Medical Center, The Ohio State University, Columbus, Ohio
| | | | | | | | | | - Ricardo L Carrau
- 1Department of Neurological Surgery, and
- 2Otolaryngology-Head and Neck Surgery, Wexner Medical Center, The Ohio State University, Columbus, Ohio
| | - Daniel M Prevedello
- 1Department of Neurological Surgery, and
- 2Otolaryngology-Head and Neck Surgery, Wexner Medical Center, The Ohio State University, Columbus, Ohio
| |
Collapse
|
9
|
Ishikawa T, Akutsu H, Hara T, Tanaka S, Masumoto T, Ishikawa E. Intraosseous schwannoma in the clivus mimicking chordoma treated with endoscopic endonasal surgery: A case report. Surg Neurol Int 2022; 13:346. [PMID: 36128097 PMCID: PMC9479550 DOI: 10.25259/sni_473_2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 07/25/2022] [Indexed: 11/04/2022] Open
Abstract
Background:
Intraosseous schwannomas are extremely rare and they have not yet been reported to occur in the clivus. We report a schwannoma in the clivus mimicking chordoma and review intraosseous schwannomas of the skull.
Case Description:
A 62-year-old man presented with gradually worsening hoarseness with dysphagia and atrophy of the left tongue, trapezius muscle, and sternocleidomastoid muscle. Magnetic resonance imaging showed that the tumor was mainly located in the clivus, and a computed tomography (CT) scan revealed an osteolytic lesion with expansion of the clivus and preservation of the bony cortex. Endoscopic endonasal surgery was performed to diagnose and treat symptoms. The tumor was subtotally removed without any complications. The histopathological findings revealed typical schwannoma, which showed Antoni A and Antoni B patterns positive for S100 protein. Based on the preoperative imaging, intraoperative and histopathological findings, the tumor was considered to be an intraosseous schwannoma in the clivus, and no recurrence was observed after 1 year of postoperative follow-up.
Conclusion:
Even though the intraosseous schwannoma in the clivus is uncommon, it should be considered as a differential diagnosis if an expansive lesion without destruction of the cortical bone is shown on CT as well as iso-hyperintensity on T2-weighted magnetic resonance imaging.
Collapse
Affiliation(s)
| | - Hiroyoshi Akutsu
- Department of Neurosurgery, Dokkyo Medical University, Shimotsuga,
| | - Takuma Hara
- Department of Neurosurgery, University of Tsukuba, Tsukuba,
| | - Shuho Tanaka
- Department of Otolaryngology, University of Tsukuba, Tsukuba,
| | - Tomohiko Masumoto
- Department of Diagnostic Radiology, Toranomon Hospital, Tokyo, Japan
| | | |
Collapse
|
10
|
Li L, Xu H, London NR, Carrau RL, Jin Y, Chen X. Endoscopic trans-lateral oropharyngeal wall approach to the petrous apex and the petroclival region. Head Neck 2022; 44:2633-2639. [PMID: 35866311 DOI: 10.1002/hed.27156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 06/19/2022] [Accepted: 07/07/2022] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND A trans-lateral oropharyngeal wall approach (TLOWA) to the petrous apex has not been previously defined. This study aims to assess the feasibility of a TLOWA for surgical access to the petrous apex and the petroclival region. METHODS An endoscopic TLOWA for exposure of the petrous apex and petroclival region was performed on five cadaveric specimens (10 sides). Associated anatomical landmarks were defined, and the strategies for maximal exposure of the internal carotid artery (ICA) were explored. RESULTS Via a TLOWA, the parapharyngeal ICA was widely exposed in all 10 sides. Following transection of the Eustachian tube, the inferior petrous apex and petroclival region could be sufficiently exposed. After drilling the anteroinferior bony canal, the horizontal petrous ICA, foramen lacerum, and the paraclival ICA could be adequately revealed. CONCLUSION The TLOWA may provide an alternative corridor for access to the petrous apex and the petroclival region. The parapharyngeal, petrous, lower paraclival ICAs, and the foramen lacerum could be adequately exposed via the TLOWA.
Collapse
Affiliation(s)
- Lifeng Li
- Department of Otolaryngology-Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, China
| | - Hongbo Xu
- Department of Otolaryngology-Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, China
| | - Nyall R London
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Ricardo L Carrau
- Department of Otolaryngology-Head & Neck Surgery, The James Cancer Hospital at the Wexner Medical Center of The Ohio State University, Columbus, Ohio, USA
| | - Yonggang Jin
- Department of Otolaryngology-Head and Neck Surgery, Xianghe People's Hospital, Hebei, China
| | - Xiaohong Chen
- Department of Otolaryngology-Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, China
| |
Collapse
|
11
|
Kovalev A, Sufianov R, Prevedello D, Borba L, Mastronardi L, Ilyasova T, Daniel RT, Messerer M, Rassi M, Zhang G. Endoscopic Transnasal Approaches to Petrous Apex. Front Surg 2022; 9:903578. [PMID: 35651680 PMCID: PMC9150781 DOI: 10.3389/fsurg.2022.903578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 04/21/2022] [Indexed: 11/25/2022] Open
Abstract
Endoscopic extended transnasal approaches to the apex of the temporal bone pyramid are rapidly developing and are widely used in our time around the world. Despite this, the problem of choosing an approach remains relevant and open not only between the “open” and “endoscopic transnasal” access groups but also within the latter. In the article, we systematized all endoscopic approaches to the pyramid of the temporal bone and divided them into three large groups: medial, inferior, and superior—in accordance with the anatomical relationship with the internal carotid artery—and also presented their various, modern (later described), modifications that allow you to work more targeted, depending on the nature of the neoplasm and the goals of surgical intervention, which in turn allows you to complete the operation with minimal losses, and improve the quality of life of the patient in the early and late postoperative period. We described the indications and limitations for these accesses and the problems that arise in the way of their implementation, which in turn can theoretically allow us to obtain an algorithm for choosing access, as well as identify growth points.
Collapse
Affiliation(s)
- Alexander Kovalev
- Department of neurooncology, Federal Center of Neurosurgery, Tyumen, Russia
| | - Rinat Sufianov
- Department of Neurosurgery, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
| | - Daniel Prevedello
- Department of Neurological Surgery, The Ohio State University, Columbus, OH, United States
| | - Luís Borba
- Department of Neurosurgery, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
- Department of Neurosurgery, Federal University of Paraná, Curitiba, Brazil
| | - Luciano Mastronardi
- Department of Neurosurgery, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
- Division of Neurosurgery, San Filippo Neri Hospital, Roma, Italy
| | - Tatiana Ilyasova
- Department of Internal Diseases, Bashkir State Medical University, Ufa, Republic of Bashkortostan, Russia
| | - Roy Thomas Daniel
- Department of Neurosurgery, University Hospital of Lausanne, Lausanne, Switzerland
| | - Mahmoud Messerer
- Department of Neurosurgery, University Hospital of Lausanne, Lausanne, Switzerland
| | - Marcio Rassi
- Department of Neurosurgery, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
- Department of Neurosurgery, A.C. Camargo Cancer Center, São Paulo, SP, Brazil
| | - Guang Zhang
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, China
- Correspondence: Guang Zhang
| |
Collapse
|
12
|
Morinaga Y, Akutsu H, Kino H, Hara T, Tanaka S, Miyamoto H, Matsuda M, Ishikawa E. Endoscopic endonasal transmaxillary-pterygoid approach for skull-base non-vestibular schwannomas in 10 consecutive patients. Acta Neurochir (Wien) 2022; 164:331-341. [PMID: 34812948 DOI: 10.1007/s00701-021-05068-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 11/09/2021] [Indexed: 11/24/2022]
Abstract
PURPOSE Non-vestibular schwannomas (NVSs) of the skull base occur in several sites, and few previous studies have evaluated the usefulness of the endoscopic endonasal transmaxillary-pterygoid approach (EETMPA) to resect these lesions. We aimed to evaluate the characteristics and clinical outcomes of patients who underwent EETMPA for skull-base NVSs and to investigate the efficacy, safety, and indications for the procedure. METHODS We retrospectively reviewed the clinical data of 10 consecutive patients (mean age, 45 ± 17) who underwent EETMPA for skull-base NVSs at the University of Tsukuba hospital between 2013 and 2020. We also calculated the total tumor volume and the size of the corridor to the tumor for EEA (SCEEA) in nine patients who underwent EEA for NVSs adjacent to the Meckel's cave or cavernous sinus. RESULTS Nine patients (9/10), including five women (5/10), underwent primary surgery. Gross total resection and subtotal resection were achieved in five patients each (5/10). Postoperatively, one patient showed a new and mild cranial nerve V sensory deficit and one patient showed slight worsening of abducens nerve palsy. The greater palatine nerve was amputated in two patients; however, permanent perception loss in the soft palate was observed in one patient. The Vidian nerve was sacrificed in four patients, and new dry eye occurred in one patient. None of the patients experienced postoperative tumor recurrence or regrowth during the follow-up period of 40 ± 28 months. CONCLUSION EETMPA is safe and effective for excising skull-base NVSs which are not eligible for radiosurgery leading to a high rate of successful resection and a high rate of but mild neurological sequela. The EEA is appropriate when the tumor extends to the paranasal sinus with sufficient SCEEA.
Collapse
Affiliation(s)
- Yusuke Morinaga
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
- Department of Neurosurgery, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Tochigi, 321-0293, Japan
| | - Hiroyoshi Akutsu
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan.
- Department of Neurosurgery, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Tochigi, 321-0293, Japan.
| | - Hiroyoshi Kino
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Takuma Hara
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Shuho Tanaka
- Department of Otolaryngology, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Hidetaka Miyamoto
- Department of Otolaryngology, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Masahide Matsuda
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Eiichi Ishikawa
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| |
Collapse
|
13
|
Karadag A, Kirgiz PG, Bozkurt B, Kucukyuruk B, ReFaey K, Middlebrooks EH, Senoglu M, Tanriover N. The benefits of inferolateral transtubercular route on intradural surgical exposure using the endoscopic endonasal transclival approach. Acta Neurochir (Wien) 2021; 163:2141-2154. [PMID: 33847826 DOI: 10.1007/s00701-021-04835-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 03/26/2021] [Indexed: 02/06/2023]
Abstract
BACKGROUND Surgical access to the ventral pontomedullary junction (PMJ) can be achieved through various corridors depending on the location and extension of the lesion. The jugular tubercle (JT), a surgically challenging obstacle to access the PMJ, typically needs to be addressed in transcranial exposures. We describe the endoscopic endonasal transclival approach (EETCA) and its inferolateral transtubercular extension to assess the intradural surgical field gained through JT removal. We also complement the dissections with an illustrative case. METHODS EETCA was surgically simulated, and the anatomical landmarks were assessed in eight cadaveric heads. Microsurgical dissections were additionally performed along the endoscopic surgical path. Lastly, we present an intraoperative video of the trans-JT approach in a patient with lower clival chordoma. RESULTS The EETCA allowed adequate extracranial visualization and removal of the JT. The surgical bony window-obtained along the clivus and centered at the JT via the EETCA-measured 11 × 9 × 7 mm. Removal of the JT provided an improved intradural field within the lower third of the cerebellopontine cistern to expose an area bordered by the cranial nerves VII/VIII and flocculus superior and anterior margin of the lateral recess of the fourth ventricle and cranial nerves IX-XI inferiorly, centered on the foramen of Luschka. CONCLUSIONS Removal of the JT via EETCA improves exposure along the lower third of the cerebellopontine and upper cerebellomedullary cisterns. The inferolateral transtubercular extension of the EETCA provides access to the lateral recess of the fourth ventricle, in combination with the ventral midline pontomedullary region.
Collapse
|
14
|
Uozumi Y, Taniguchi M, Nakai T, Kimura H, Umehara T, Kohmura E. Comparative Evaluation of 3-Dimensional High Definition and 2-Dimensional 4-K Ultra-High Definition Endoscopy Systems in Endonasal Skull Base Surgery. Oper Neurosurg (Hagerstown) 2021; 19:281-287. [PMID: 31960059 DOI: 10.1093/ons/opz426] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 12/01/2019] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND The differences between 3-dimensional (3D) high definition (HD) and 2-dimensional (2D) 4-K ultra-HD (4K) endoscopy and their respective advantages remain unclear. OBJECTIVE To evaluate the utility of these endoscopy systems in endonasal skull base surgery. METHODS Consecutive series of endoscopic endonasal surgeries performed after introduction of 3D/HD and 2D/4K systems (July 2017) were retrospectively evaluated. Sporadic cases treated with either system, or a conventional 2D standard definition (SD) system, during the rental period from March 2016 were also included. Objective comparisons between the systems were made for newly diagnosed Knosp grade 0 to 3 pituitary adenomas. Surgical procedures were divided into nasal, sphenoidal, and intradural phases, and the surgical procedural time was compared for each phase. The time required for and accuracy of suturing the sellar floor dura was also evaluated. RESULTS A total of 74 cases were treated with 3D/HD and/or 2D/4K, and 12 cases with 2D/SD. 3D/HD was advantageous in the nasal phase because of its intuitive depth perception. 2D/4K was advantageous in the intradural phase because of its superior image quality. Surgical time of the nasal phase with 3D/HD, and that of the intradural phase with 2D/4K, were significantly shorter than that with 2D/SD. The time required for and accuracy of sellar floor dural suturing showed a trend toward improving in the order of 2D/SD, 2D/4K, and 3D/HD. CONCLUSION 3D/HD and 2D/4K endoscopy systems have different advantages, which are useful in distinct surgical phases. Understanding the characteristics of endoscopy systems is important for selecting the most appropriate system for distinct surgical situations.
Collapse
Affiliation(s)
- Yoichi Uozumi
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Masaaki Taniguchi
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Tomoaki Nakai
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Hidehito Kimura
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Toru Umehara
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan.,Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Eiji Kohmura
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan
| |
Collapse
|
15
|
Morinaga Y, Akutsu H, Kino H, Tanaka S, Miyamoto H, Matsuda M, Yasuda M, Ishikawa E. Endoscopic endonasal extreme far-medial approach for a lower clivus osteochondroma in a patient with hereditary multiple exostoses: illustrative case. JOURNAL OF NEUROSURGERY: CASE LESSONS 2021; 1:CASE2153. [PMID: 35855014 PMCID: PMC9245849 DOI: 10.3171/case2153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 02/19/2021] [Indexed: 11/06/2022]
Abstract
BACKGROUND The authors reported on the use of endoscopic endonasal surgery (EES) for clivus osteochondroma in a patient with hereditary multiple exostoses (HME), a rare pediatric disorder characterized by the formation of osteochondromas adjacent to the growth plates of the axial and appendicular skeletal elements. OBSERVATIONS A 26-year-old man with a family history of HME reported progressive hoarseness and dysphagia over the previous 6 months. He was referred to us after magnetic resonance imaging (MRI) showed a bone tumor in the lower clivus. MRI revealed tumor proliferation in the lower clivus and its extension to the bilateral occipital condyle and jugular tubercle. The hypoglossal canal and jugular foramen were encased on the right side, whereas the medulla oblongata was compressed. The tumor was subtotally resected with EES, and the brainstem was successfully decompressed. The pathological diagnosis was exostoses. Transient postoperative worsening of dysphagia improved within 1 month without other neurological deficits. The patient underwent posterior occipitoaxial fixation 3 months after EES to correct instability and local lateral tilt of the right atlanto-occipital joint. LESSONS The authors’ experience showed that EES is effective for resection of lower clivus osteochondromas, including the cartilaginous cap, and may improve clinical outcomes in patients with HME.
Collapse
Affiliation(s)
| | | | | | - Shuho Tanaka
- Otolaryngology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan; and
| | - Hidetaka Miyamoto
- Otolaryngology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan; and
| | | | - Muneyoshi Yasuda
- Department of Neurosurgery, Ichinomiyanishi Hospital, Ichinomiya, Aichi, Japan
| | | |
Collapse
|
16
|
Umehara T, Taniguchi M, Akutsu N, Kimura H, Uozumi Y, Nakai T, Kishima H, Kohmura E. Anatomical variation of the internal carotid artery and its implication to the endoscopic endonasal translacerum approach. Head Neck 2021; 43:1535-1544. [PMID: 33502813 DOI: 10.1002/hed.26618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 10/09/2020] [Accepted: 01/14/2021] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND The endoscopic endonasal trans-lacerum approach (EETLA) is useful in handling skull base tumors around inferior petrous apex (IPA); however, its surgical corridor is exclusively a triangular space (supra-eustachian triangle [SET]), between the internal carotid artery (ICA) and eustachian tube. METHODS We investigated correlation between SET size and extent of resection around the IPA (lateral extent of resection [EOR]) through a retrospective analysis of 15 surgeries using EETLA. RESULTS Of 15 cases (9 chordomas, 4 chondrosarcomas, and 2 meningiomas), 20 sides of IPA were affected by the tumor. When being restricted to sides with severe lateral tumor extension beyond the midpoint of petrous ICA (10 sides), the SET size was significantly broader in the group with lateral EOR of ≥90% (p value = 0.019). CONCLUSIONS The SET size was a powerful index of tumor resectability in EETLA, especially in cases with severe tumor extension. The individual anatomical variations should be considered when determining EETLA application.
Collapse
Affiliation(s)
- Toru Umehara
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.,Department of Neurosurgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Masaaki Taniguchi
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
| | - Nobuyuki Akutsu
- Department of Neurosurgery, Hyogo Prefectural Kobe Children's Hospital, Kobe, Hyogo, Japan
| | - Hidehito Kimura
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
| | - Yoichi Uozumi
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
| | - Tomoaki Nakai
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
| | - Haruhiko Kishima
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Eiji Kohmura
- Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
| |
Collapse
|
17
|
Li L, London NR, Prevedello DM, Carrau RL. Role of resection of torus tubarius to maximize the endonasal exposure of the inferior petrous apex and petroclival area. Head Neck 2020; 43:725-732. [PMID: 33174322 DOI: 10.1002/hed.26538] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 10/30/2020] [Indexed: 11/06/2022] Open
Abstract
Endoscopic access to the petrous apex and petroclival region often requires sacrificing the Eustachian tube (ET). This study aimed to compare the maximum exposure of the petrous apex and petroclival region via an endonasal corridor when sparing or resecting the ET and its torus. Six cadaveric specimens (12 sides) were dissected through an endonasal transpterygoid approach. Endonasal exposure of the petroclival region was completed using techniques that included the preservation of the ET (group 1), resection of the torus tubarius (group 2), and resection of the ET (group 3) were sequentially performed on each side. The working distances from the anterior genu of the petrous internal carotid artery (ICA) to the inferior boundaries of each corridor were measured and compared. In group 1, the medial petrous apex and petroclival sulcus could be exposed with a working distance of 4.08 ± 0.67 mm. In group 2, the fossa of Rosenmüller, inferior petrous apex, and hypoglossal canal could be exposed, with a significantly increased working distance of 18.33 ± 0.89 mm (P = .001). In group 3, the exposure and ICA control was superior and offered a working distance of 20.67 ± 0.78 mm. No statistically significant difference derived from comparing groups 2 and 3 (P = .875). Resection of the torus tubarius can increase exposure of the petrous apex and petroclival region. It provides an alternative to resecting the ET, which might be beneficial for maintenance of middle ear function. ET resection, however, seems superior when ICA control is required.
Collapse
Affiliation(s)
- Lifeng Li
- Department of Otolaryngology - Head & Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China.,Department of Otolaryngology - Head & Neck Surgery, The James Cancer Hospital, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA
| | - Nyall R London
- Department of Otolaryngology - Head & Neck Surgery, The James Cancer Hospital, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA.,Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Daniel M Prevedello
- Department of Otolaryngology - Head & Neck Surgery, The James Cancer Hospital, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA.,Department of Neurological Surgery, The James Cancer Hospital, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA
| | - Ricardo L Carrau
- Department of Otolaryngology - Head & Neck Surgery, The James Cancer Hospital, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA.,Department of Neurological Surgery, The James Cancer Hospital, Wexner Medical Center, The Ohio State University, Columbus, Ohio, USA
| |
Collapse
|
18
|
Shin M, Hasegawa H, Miyawaki S, Kakigi A, Takizawa T, Kondo K, Shiode T, Kin T, Saito N. Endoscopic transmastoid posterior petrosal approach for locally aggressive tumors in the petrous part of the temporal bone involving the internal auditory canal, jugular foramen, and hypoglossal canal. J Neurosurg 2020; 133:1248-1260. [PMID: 31561213 DOI: 10.3171/2019.5.jns19187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 05/30/2019] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The posterior petrosal approach is an established surgical method offering wide access to skull base lesions through mastoid air cells. The authors describe their experience with the endoscopic transmastoid "posterior petrosal" approach (EPPAP) for skull base tumors involving the internal auditory canal (IAC), jugular foramen, and hypoglossal canal. METHODS The EPPAP was performed for 7 tumors (3 chordomas, 2 chondrosarcomas, 1 schwannoma, and 1 solitary fibrous tumor). All surgical procedures were performed under endoscopic visualization with mastoidectomy. The compact bone of the mastoid air cells and posterior surface of the petrous bone are carefully removed behind the semicircular canals. When removal of cancellous bone is extended superomedially through the infralabyrinthine space, the surgeon can expose the IAC and petrous portion of the internal carotid artery to reach the petrous apex (infralabyrinthine route). When removal of cancellous bone is extended inferomedially along the sigmoid sinus, the surgeon can safely reach the jugular foramen (transjugular route). Drilling of the inferior surface of petrous bone is extended further inferoposteriorly behind the jugular bulb to approach the hypoglossal canal and parapharyngeal space through the lateral aspect of the occipital condyle (infrajugular route). RESULTS Of the 7 tumors, gross-total resection was achieved in 4 (57.1%), subtotal resection (> 95% removal) in 2 (28.6%), and partial resection (90% removal) in 1 (14.2%). Postoperatively, 2 of 3 patients with exudative otitis media showed improvement of hearing deterioration, as did 2 patients with tinnitus. Hypoglossal nerve palsy and swallowing difficulty were improved after surgery in 2 patients and 1 patient, respectively. In 1 patient with severe cranial nerve deficits before surgery, symptoms did not show any improvement. CONCLUSIONS The authors present their preliminary experience with EPPAP for skull base tumors in the petrous part of the temporal bone and the lateral part of the occipital condyle involving the cranial nerves and internal carotid arteries. The microscope showed a higher-quality image and illumination in the low-power field. However, the endoscope could offer wider visualization of the surgical field and contribute to minimizing the size of the surgical pathways, necessity of brain retraction, and eventually the invasiveness of surgery. Thus, the EPPAP may be safe and effective for skull base tumors in the petrous region, achieving balance between the radicality and invasiveness of the skull base surgery.
Collapse
Affiliation(s)
| | | | | | - Akinobu Kakigi
- 2Otolaryngology, The University of Tokyo Hospital, Tokyo, Japan
| | | | - Kenji Kondo
- 2Otolaryngology, The University of Tokyo Hospital, Tokyo, Japan
| | | | | | | |
Collapse
|
19
|
Revuelta Barbero JM, Subramaniam S, Noiphithak R, Yanez-Siller JC, Otto BA, Carrau RL, Prevedello DM. The Eustachian Tube as a Landmark for Early Identification of the Abducens Nerve During Endonasal Transclival Approaches. Oper Neurosurg (Hagerstown) 2020; 16:743-749. [PMID: 30257011 DOI: 10.1093/ons/opy275] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 08/20/2018] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Expanded endonasal approaches have the potential to injure the abducens nerve (cranial nerve [CN] VI). The nerve's root entry zone (REZ) and cisternal segment (CS) are particularly prone to injury during the clivus resection and dural incision of transclival approaches. OBJECTIVE To investigate the role of the eustachian tube (ET) as a surgical landmark for the REZ and CS of CN VI. METHODS Transclival expanded endonasal approaches were performed bilaterally in 6 fresh-frozen cadaveric specimens (12 sides). Anatomic relationships between ET and CN VI were documented with neuronavigation. RESULTS The mean vertical distance from the inferior brainstem point to the horizontal projection of CN VI REZ, CS midpoint, and interdural segment (ID) were 26.38 mm (95% confidence interval [CI] 17.36-35.4), 38.61 mm (95% CI 25.61-51.61), and 42.68 mm (95% CI 30.14-55.22), respectively. The relative vertical distance from the ET to the horizontal projections of the REZ, CS midpoint, and its ID were 6.43 mm (95% CI 3.25-9.61), 18.66 mm (95% CI 11.52-25.8), and 22.72 mm (95% CI 16.02-29.42), respectively. In the axial plane the angles between the ET and (1) the REZ and its midline horizontal projection point, (2) the midpoint and its midline horizontal projection point, and (3) ID and its midline horizontal projection point were 9.81 ± SD 5.20°, 18.50 ± SD 4.87°, and 24.71 ± SD 6.21°, respectively. CONCLUSION The ET may serve as a constant landmark to reliably predict the position of the REZ and CS of CN VI.
Collapse
Affiliation(s)
- Juan M Revuelta Barbero
- Department of Neurological Surgery, Wexner Medical Center, The Ohio State University, Columbus, Ohio
| | - Somasundaram Subramaniam
- Department of Otolaryngology-Head and Neck Surgery, Wexner Medical Center at The Ohio State University, Columbus, Ohio
| | - Raywat Noiphithak
- Department of Neurological Surgery, Wexner Medical Center, The Ohio State University, Columbus, Ohio
| | - Juan C Yanez-Siller
- Department of Otolaryngology-Head and Neck Surgery, Wexner Medical Center at The Ohio State University, Columbus, Ohio.,Department of Otolaryngology-Head and Neck Surgery, University of Missouri-Columbia, Columbia, Missouri
| | - Bradley A Otto
- Department of Neurological Surgery, Wexner Medical Center, The Ohio State University, Columbus, Ohio.,Department of Otolaryngology-Head and Neck Surgery, Wexner Medical Center at The Ohio State University, Columbus, Ohio
| | - Ricardo L Carrau
- Department of Neurological Surgery, Wexner Medical Center, The Ohio State University, Columbus, Ohio.,Department of Otolaryngology-Head and Neck Surgery, Wexner Medical Center at The Ohio State University, Columbus, Ohio
| | - Daniel M Prevedello
- Department of Neurological Surgery, Wexner Medical Center, The Ohio State University, Columbus, Ohio.,Department of Otolaryngology-Head and Neck Surgery, Wexner Medical Center at The Ohio State University, Columbus, Ohio
| |
Collapse
|
20
|
Mangussi-Gomes J, Alves-Belo JT, Truong HQ, Nogueira GF, Wang EW, Fernandez-Miranda JC, Gardner PA, Snyderman CH. Anatomical Limits of the Endoscopic Contralateral Transmaxillary Approach to the Petrous Apex and Petroclival Region. Skull Base Surg 2020; 83:44-52. [DOI: 10.1055/s-0040-1716693] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 07/27/2020] [Indexed: 10/23/2022]
Abstract
Abstract
Objectives This study aimed to establish the anatomical landmarks for performing a contralateral transmaxillary approach (CTM) to the petrous apex (PA) and petroclival region (PCR), and to compare CTM with a purely endoscopic endonasal approach (EEA).
Design EEA and CTM to the PA and PCR were performed bilaterally in eight human anatomical specimens. Surgical techniques and anatomical landmarks were described, and EEA was compared with CTM with respect to ability to reach the contralateral internal acoustic canal (IAC). Computed tomographic scans of 25 cadaveric heads were analyzed and the “angle” and “reach” of CTM and EEA were measured.
Results Entry to the PA via a medial approach was limited by (1) abducens nerve superiorly, (2) internal carotid artery (ICA) laterally, and (3) petroclival synchondrosis inferiorly (Gardner's triangle). With CTM, it was possible to reach the contralateral IAC bilaterally in all specimens dissected, without dissection of the ipsilateral ICAs, pterygopalatine fossae, and Eustachian tubes. Without CTM, reaching the contralateral IAC was possible only if: (1) angled endoscopes and instruments were employed or (2) the pterygopalatine fossa was dissected with mobilization of the ICA and resection of the Eustachian tube. The average “angle” and “reach” advantages for CTM were 25.6-degree greater angle of approach behind the petrous ICA and 1.4-cm more lateral reach.
Conclusion The techniques and anatomical landmarks for CTM to the PA and PCR are described. Compared with a purely EEA, the CTM provides significant “angle” and “reach” advantages for the PA and PCR.
Collapse
Affiliation(s)
- João Mangussi-Gomes
- Surgical Neuroanatomy Lab, Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
| | - João T. Alves-Belo
- Surgical Neuroanatomy Lab, Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
| | - Huy Q. Truong
- Surgical Neuroanatomy Lab, Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
| | | | - Eric W. Wang
- Department of Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
| | - Juan C. Fernandez-Miranda
- Surgical Neuroanatomy Lab, Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
- Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
| | - Paul A. Gardner
- Surgical Neuroanatomy Lab, Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
- Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
| | - Carl H. Snyderman
- Department of Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
| |
Collapse
|
21
|
Endoscopic endonasal and transorbital routes to the petrous apex: anatomic comparative study of two pathways. Acta Neurochir (Wien) 2020; 162:2097-2109. [PMID: 32556526 DOI: 10.1007/s00701-020-04451-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Accepted: 06/08/2020] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND OBJECTIVE Surgical approaches to the petrous apex region are extremely challenging; while subtemporal approaches and variations represent the milestone of the surgical modules to reach such deep anatomical target, in a constant effort to develop minimally invasive neurosurgical routes, the endoscopic endonasal approach (EEA) has been tested to get a viable corridor to the petroclival junction. Lately, another ventral endoscopic minimally invasive route, i.e., the superior eyelid endoscopic transorbital approach, has been proposed to access the most lateral aspect of the skull base, including the petrous apex region. Our anatomic study aims to compare and combine such two endoscopic minimally invasive pathways to get full access to the petrous apex. Three-dimensional reconstructions and quantitative and morphometric data have been provided. MATERIAL AND METHODS Five human cadaveric heads (10 sides) were dissected. The lab rehearsals were run as follows: (i) preliminary pre-operative CT scans of each specimen, (ii) pre-dissection planning of the petrous apex removal and its quantification, (iii) petrous apex removal via endoscopic endonasal route, (iv) post-operative CT scans, (v) petrous apex removal via endoscopic transorbital route, and (v) final post-operative CT scan with quantitative analysis. Neuronavigation was used to guide all dissections. RESULTS The two endoscopic minimally invasive pathways allowed a different visualization and perspective of the petrous apex, and its surrounding neurovascular structures. After both corridors were completed, a communication between the surgical pathways was highlighted, in a so-called connection area, surrounded by the following important neurovascular structures: anteriorly, the internal carotid artery and the Gasserian ganglion; laterally, the internal acoustic canal; superiorly, the abducens nerve, the trigeminal root, and the tentorium cerebelli; inferomedially, the remaining clivus and the inferior petrosal sinus; and posteriorly, the exposed area of the brainstem. Used in a combined fashion, such multiportal approach provided a total of 97% of petrous apex removal. In particular, the transorbital route achieved a mean of 48.3% removal in the most superolateral portion of the petrous apex, whereas the endonasal approach provided a mean of 48.7% bone removal in the most inferomedial part. The difference between the two approaches was found to be not statistically significant (p = 0.67). CONCLUSION The multiportal combined endoscopic endonasal and transorbital approach to the petrous apex provides an overall bone removal volume of 97% off the petrous apex. In this paper, we highlighted that it was possible to uncover a common path between these two surgical pathways (endonasal and transorbital) in a so-called connection area. Potential indications of this multiportal approach may be lesions placed in or invading the petrous apex and petroclival regions that can be inadequately reached via transcranial paths or via an endonasal endoscopic route alone.
Collapse
|
22
|
Li KL, Agarwal V, Moskowitz HS, Abuzeid WM. Surgical approaches to the petrous apex. World J Otorhinolaryngol Head Neck Surg 2020; 6:106-114. [PMID: 32596655 PMCID: PMC7296478 DOI: 10.1016/j.wjorl.2019.11.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 11/27/2019] [Indexed: 11/18/2022] Open
Abstract
The petrous apex is a difficult to reach surgical area due to its deep position in the skull base and many vital surrounding structures. Petrous apex pathology ranges from extradural cholesterol granulomas, cholesteatomas, asymmetric pneumatization, and osteomyelitis to intradural meningiomas and schwannomas. Certain lesions, such as cholesterol granulomas, can be managed with drainage while neoplastic lesions must be completely resected. Surgical options use open, endoscopic, and combined techniques and are categorized into anterior, lateral, and posterior approaches. The choice of approach is determined by the nature of the pathology and location relative to vital structures and extension into surrounding structures and requires thorough preoperative evaluation and discussion of surgical goals with the patient. The purpose of this state-of-the-art review is to discuss the most commonly used surgical approaches to the petrous apex, and the anatomy on which these approaches are based.
Collapse
Affiliation(s)
- Kevin L Li
- Department of Otorhinolaryngology - Head and Neck Surgery, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Vijay Agarwal
- Department of Neurosurgery, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Howard S Moskowitz
- Department of Otorhinolaryngology - Head and Neck Surgery, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Waleed M Abuzeid
- Department of Otorhinolaryngology - Head and Neck Surgery, Albert Einstein College of Medicine, Bronx, NY, USA
| |
Collapse
|
23
|
Wang EW, Zanation AM, Gardner PA, Schwartz TH, Eloy JA, Adappa ND, Bettag M, Bleier BS, Cappabianca P, Carrau RL, Casiano RR, Cavallo LM, Ebert CS, El-Sayed IH, Evans JJ, Fernandez-Miranda JC, Folbe AJ, Froelich S, Gentili F, Harvey RJ, Hwang PH, Jane JA, Kelly DF, Kennedy D, Knosp E, Lal D, Lee JYK, Liu JK, Lund VJ, Palmer JN, Prevedello DM, Schlosser RJ, Sindwani R, Solares CA, Tabaee A, Teo C, Thirumala PD, Thorp BD, de Arnaldo Silva Vellutini E, Witterick I, Woodworth BA, Wormald PJ, Snyderman CH. ICAR: endoscopic skull-base surgery. Int Forum Allergy Rhinol 2020; 9:S145-S365. [PMID: 31329374 DOI: 10.1002/alr.22326] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 02/12/2019] [Accepted: 02/15/2019] [Indexed: 12/30/2022]
Abstract
BACKGROUND Endoscopic skull-base surgery (ESBS) is employed in the management of diverse skull-base pathologies. Paralleling the increased utilization of ESBS, the literature in this field has expanded rapidly. However, the rarity of these diseases, the inherent challenges of surgical studies, and the continued learning curve in ESBS have resulted in significant variability in the quality of the literature. To consolidate and critically appraise the available literature, experts in skull-base surgery have produced the International Consensus Statement on Endoscopic Skull-Base Surgery (ICAR:ESBS). METHODS Using previously described methodology, topics spanning the breadth of ESBS were identified and assigned a literature review, evidence-based review or evidence-based review with recommendations format. Subsequently, each topic was written and then reviewed by skull-base surgeons in both neurosurgery and otolaryngology. Following this iterative review process, the ICAR:ESBS document was synthesized and reviewed by all authors for consensus. RESULTS The ICAR:ESBS document addresses the role of ESBS in primary cerebrospinal fluid (CSF) rhinorrhea, intradural tumors, benign skull-base and orbital pathology, sinonasal malignancies, and clival lesions. Additionally, specific challenges in ESBS including endoscopic reconstruction and complication management were evaluated. CONCLUSION A critical review of the literature in ESBS demonstrates at least the equivalency of ESBS with alternative approaches in pathologies such as CSF rhinorrhea and pituitary adenoma as well as improved reconstructive techniques in reducing CSF leaks. Evidence-based recommendations are limited in other pathologies and these significant knowledge gaps call upon the skull-base community to embrace these opportunities and collaboratively address these shortcomings.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Adam J Folbe
- Michigan Sinus and Skull Base Institute, Royal Oak, MI
| | | | | | - Richard J Harvey
- University of Toronto, Toronto, Canada.,University of New South Wales, Sydney, Australia
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Charles Teo
- Prince of Wales Hospital, Randwick, Australia
| | | | | | | | | | | | | | | |
Collapse
|
24
|
Wang WH, Lieber S, Mathias RN, Sun X, Gardner PA, Snyderman CH, Wang EW, Fernandez-Miranda JC. The foramen lacerum: surgical anatomy and relevance for endoscopic endonasal approaches. J Neurosurg 2019; 131:1571-1582. [PMID: 30544351 DOI: 10.3171/2018.6.jns181117] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 06/28/2018] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The foramen lacerum is a relevant skull base structure that has been neglected for many years. From the endoscopic endonasal perspective, the foramen lacerum is a key structure due to its location at the crossroad between the sagittal and coronal planes. The objective of this study was to provide a detailed investigation of the surgical anatomy of the foramen lacerum and its adjacent structures based on anatomical dissections and imaging studies, propose several relevant key surgical landmarks, and demonstrate the surgical technique for its full exposure with several illustrative cases. METHODS Ten colored silicone-injected anatomical specimens were dissected using a transpterygoid approach to the foramen lacerum region in a stepwise manner. Five similar specimens were used for a comparative transcranial approach. The osseous anatomy was examined in 32 high-resolution multislice CT studies and 1 disarticulated skull. Representative cases were selected to illustrate the application of the findings. RESULTS The pterygosphenoidal fissure is the synchondrosis between the lacerum process of the pterygoid bone and the floor of the sphenoid bone. It constantly converges with the posterior end of the vidian canal at a 45° angle, and its posterolateral end points directly to the lacerum foramen. The pterygoid tubercle separates the vidian canal from the pterygosphenoidal fissure, and forms the anterior wall of the lower part of the foramen lacerum. The lingual process, which forms the lateral wall of the foramen lacerum, was identified in 53 of 64 sides and featured an average height of 5 mm. The mandibular strut separates the foramen lacerum from the foramen ovale and had an average width of 5 mm. CONCLUSIONS This study provides relevant surgical landmarks and a systematic approach to the foramen lacerum by defining anterior, medial, lateral, and inferior walls that may facilitate its safe exposure for effective removal of lesions while minimizing the risk of injury to the internal carotid artery.
Collapse
Affiliation(s)
- Wei-Hsin Wang
- 1Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
- 3Department of Neurosurgery, Taipei Veterans General Hospital, School of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Stefan Lieber
- 1Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Roger Neves Mathias
- 1Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Xicai Sun
- 1Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Paul A Gardner
- 1Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Carl H Snyderman
- 2Department of Otolaryngology, University of Pittsburgh, Pennsylvania; and
| | - Eric W Wang
- 2Department of Otolaryngology, University of Pittsburgh, Pennsylvania; and
| | - Juan C Fernandez-Miranda
- 1Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| |
Collapse
|
25
|
Kaen A, Cárdenas Ruiz-Valdepeñas E, Di Somma A, Esteban F, Márquez Rivas J, Ambrosiani Fernandez J. Refining the anatomic boundaries of the endoscopic endonasal transpterygoid approach: the "VELPPHA area" concept. J Neurosurg 2019; 131:911-919. [PMID: 30239316 DOI: 10.3171/2018.4.jns173070] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 04/05/2018] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The endoscopic endonasal transpterygoid route has been widely evaluated in cadavers, and it is currently used during surgery for specific diseases involving the lateral skull base. Identification of the petrous segment of the internal carotid artery (ICA) is a key step during this approach, and the vidian nerve (VN) has been described as a principal landmark for safe endonasal localization of the petrous ICA at the level of the foramen lacerum. However, the relationship of the VN to the ICA at this level is complex as well as variable and has not been described in the pertinent literature. Accordingly, the authors undertook this purely anatomical study to detail and quantify the peri-lacerum anatomy as seen via an endoscopic endonasal transpterygoid pathway. METHODS Eight human anatomical specimens (16 sides) were dissected endonasally under direct endoscopic visualization. Anatomical landmarks of the VN and the posterior end of the vidian canal (VC) during the endoscopic endonasal transpterygoid approach were described, quantitative anatomical data were compiled, and a schematic classification of the most relevant structures encountered was proposed. RESULTS The endoscopic endonasal transpterygoid approach was used to describe the different anatomical structures surrounding the anterior genu of the petrous ICA. Five key anatomical structures were identified and described: the VN, the eustachian tube, the foramen lacerum, the petroclival fissure, and the pharyngobasilar fascia. These structures were specifically quantified and summarized in a schematic acronym-VELPPHA-to describe the area. The VELPPHA area is a dense fibrocartilaginous space around the inferior compartment of the foramen lacerum that can be reached by following the VC posteriorly; this area represents the posterior limits of the transpterygoid approach and, of utmost importance, no neurovascular structures were observed through the VELPPHA area in this study, indicating that it should be a safe zone for surgery in the posterior end of the endoscopic endonasal transpterygoid approach. CONCLUSIONS The VELPPHA area represents the posterior limits of the endoscopic endonasal transpterygoid approach. Early identification of this area can enhance the safety of the endoscopic endonasal transpterygoid approach expanded to the lateral aspect of the skull base, especially when treating patients with poorly pneumatized sphenoid sinuses.
Collapse
Affiliation(s)
| | | | - Alberto Di Somma
- 2Division of Neurosurgery, School of Medicine and Surgery, Università degli Studi di Napoli Federico II, Naples, Italy
| | | | | | | |
Collapse
|
26
|
Vaz-Guimaraes F, Nakassa ACI, Gardner PA, Wang EW, Snyderman CH, Fernandez-Miranda JC. Endoscopic Endonasal Approach to the Ventral Jugular Foramen: Anatomical Basis, Technical Considerations, and Clinical Series. Oper Neurosurg (Hagerstown) 2019; 13:482-491. [PMID: 28838115 DOI: 10.1093/ons/opx014] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 01/15/2017] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Surgical exposure of the jugular foramen (JF) is challenging given its complex regional anatomy and proximity to critical neurovascular structures. OBJECTIVE To describe the anatomical basis, surgical technique, and outcomes of a group of patients who underwent the endoscopic endonasal approach to the JF. METHODS Five silicon-injected anatomical specimens were prepared for dissection. Additionally, a chart review was conducted through our patient database, searching for endonasal exposure of the JF. Demographic data, clinical presentation, pathological findings, extent of resection in the JF, and occurrence of complications were analyzed. RESULTS The endonasal exposure of the JF requires 3 sequential steps: a transpterygoid, a "far-medial," and an "extreme-medial" approach. Mobilization or transection of the cartilaginous portion of the eustachian tube (ET) is necessary. In the clinical series, cranial neuropathies were the presenting symptoms in 16 patients (89%). Eighteen tumors (10 chondrosarcomas, 7 chordomas, 1 adenocarcinoma) extended secondarily into the JF. Total tumor resection was achieved in 10 patients (56%), near total (≥90%) in 6 (33%), and subtotal (<90%) in 2 (11%). ET dysfunction (75% of cases), transient palatal numbness (17%), cerebrospinal fluid leakage (17%), and lower cranial nerve palsy (17%) were the most common postoperative complications. There were no carotid artery or jugular vein injuries. CONCLUSION The endoscopic endonasal approach to the JF requires mobilization or transection of the cartilaginous portion of the ET. This maneuver provides a safe infrapetrosal surgical route to the JF. It may be considered a valid option, in well-selected cases, for resection of malignant and recurrent cranial base tumors.
Collapse
Affiliation(s)
- Francisco Vaz-Guimaraes
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Ana Carolina I Nakassa
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Paul A Gardner
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Eric W Wang
- Department of Otolaryngology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Carl H Snyderman
- Department of Otolaryngology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Juan C Fernandez-Miranda
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| |
Collapse
|
27
|
Mehta GU, DeMonte F, Su SY, Kupferman ME, Hanna EY, Raza SM. Endoscopic endonasal transpterygoid transnasopharyngeal management of petroclival chondrosarcomas without medial extension. J Neurosurg 2019; 131:184-191. [PMID: 30074455 DOI: 10.3171/2018.3.jns172722] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2017] [Accepted: 03/01/2018] [Indexed: 11/06/2022]
Abstract
Chondrosarcomas of the skull base are malignant tumors for which surgery is the primary therapeutic option. Gross-total resection has been demonstrated to improve survival in patients with these tumors. Chondrosarcomas arising from the petroclival synchondrosis harbor particularly unique anatomical considerations that have long been a barrier to achieving such a resection. Endoscopic endonasal transpterygoid approaches have been recently used to gain improved access to such lesions; however, these approaches have classically relied on a medial to lateral transclival trajectory, which provides limited exposure for complete resection of lateral disease. In this paper the authors describe an endoscopic endonasal transpterygoid transnasopharyngeal approach that provides comprehensive access to the petroclival region through dissection of the eustachian tube with resection of the cartilaginous torus tubarius. Of note, the authors have previously demonstrated the superior outcomes and validity of this approach relative to other cranial base techniques for petroclival chondrosarcomas. Surgical outcomes in 5 cases of chondrosarcoma without medial extension are detailed. Gross-total resection was achieved in 4 of 5 patients. Postoperative complications included transient palatal numbness in all patients and eustachian tube dysfunction due to the approach. With tympanostomy tube placement, no patient had persistent hearing loss. Overall, this approach appears to be a safe and effective technique for resection of petroclival chondrosarcomas.
Collapse
Affiliation(s)
| | | | - Shirley Y Su
- 2Head and Neck Surgery, The University of Texas M.D. Anderson Cancer Center, Houston, Texas
| | - Michael E Kupferman
- 2Head and Neck Surgery, The University of Texas M.D. Anderson Cancer Center, Houston, Texas
| | - Ehab Y Hanna
- 2Head and Neck Surgery, The University of Texas M.D. Anderson Cancer Center, Houston, Texas
| | | |
Collapse
|
28
|
Di Somma A, Andaluz N, Cavallo LM, Topczewski TE, Frio F, Gerardi RM, Pineda J, Solari D, Enseñat J, Prats-Galino A, Cappabianca P. Endoscopic transorbital route to the petrous apex: a feasibility anatomic study. Acta Neurochir (Wien) 2018; 160:707-720. [PMID: 29288394 DOI: 10.1007/s00701-017-3448-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 12/21/2017] [Indexed: 11/25/2022]
Abstract
BACKGROUND While the subtemporal approach represents the surgical module milestone designed to reach the petrous apex, a novel ventral route, which is the superior eyelid endoscopic transorbital approach, has been proposed to access the skull base. Accordingly, we aimed to evaluate the feasibility of this route to the petrous apex, providing a qualitative and quantitative analysis of this relatively novel pathway. METHODS Five human cadaveric heads were dissected at the Laboratory of Surgical NeuroAnatomy of the University of Barcelona. After proper dissection planning, anterior petrosectomy via the endoscopic transorbital route was performed. Specific quantitative analysis, as well as dedicated three-dimensional reconstruction, was done. RESULTS Using the endoscopic transorbital approach, it was possible to reach the petrous apex with an average volume bone removal of 1.33 ± 0.21 cm3. Three main intradural spaces were exposed: cerebellopontine angle, middle tentorial incisura, and ventral brainstem. The first one was bounded by the origin of the trigeminal nerve medially and the facial and vestibulocochlear nerves laterally, the second extended from the origin of the oculomotor nerve to the entrance of the trochlear nerve into the tentorium free edge while the ventral brainstem area was hardly accessible through the straight, ventral endoscopic transorbital trajectory. CONCLUSION This is the first qualitative and quantitative anatomic study concerning details of the lateral aspect of the incisura and ventrolateral posterior fossa reached via the transorbital window. This manuscript is intended as a feasibility anatomic study, and further clinical contributions are mandatory to confirm the effectiveness of this approach, defining its possible role in the neurosurgical armamentarium.
Collapse
Affiliation(s)
- Alberto Di Somma
- Division of Neurosurgery, School of Medicine and Surgery, Università degli Studi di Napoli "Federico II", 80131, Naples, Italy.
| | - Norberto Andaluz
- Department of Neurosurgery, University of Cincinnati (UC) College of Medicine, Comprehensive Stroke Center at UC Neuroscience Institute, Mayfield Clinic, Cincinnati, OH, USA
| | - Luigi Maria Cavallo
- Division of Neurosurgery, School of Medicine and Surgery, Università degli Studi di Napoli "Federico II", 80131, Naples, Italy
| | - Thomaz E Topczewski
- Department of Neurosurgery, Hospital Clinic, Faculty of Medicine, Universitat de Barcelona, Barcelona, Spain
| | - Federico Frio
- Division of Neurosurgery, School of Medicine and Surgery, Università degli Studi di Napoli "Federico II", 80131, Naples, Italy
| | - Rosa Maria Gerardi
- Division of Neurosurgery, School of Medicine and Surgery, Università degli Studi di Napoli "Federico II", 80131, Naples, Italy
| | - Jose Pineda
- Laboratory of Surgical Neuroanatomy (LSNA), Faculty of Medicine, Universitat de Barcelona, Barcelona, Spain
| | - Domenico Solari
- Division of Neurosurgery, School of Medicine and Surgery, Università degli Studi di Napoli "Federico II", 80131, Naples, Italy
| | - Joaquim Enseñat
- Department of Neurosurgery, Hospital Clinic, Faculty of Medicine, Universitat de Barcelona, Barcelona, Spain
| | - Alberto Prats-Galino
- Laboratory of Surgical Neuroanatomy (LSNA), Faculty of Medicine, Universitat de Barcelona, Barcelona, Spain
| | - Paolo Cappabianca
- Division of Neurosurgery, School of Medicine and Surgery, Università degli Studi di Napoli "Federico II", 80131, Naples, Italy
| |
Collapse
|
29
|
Quantification of Surgical Route Parameters for Exposure of the Jugular Foramen Via a Trans-Mastoidal Approach Exposing Jugular Foramen in Three-Dimensional Visualization Model. J Craniofac Surg 2018; 29:787-791. [PMID: 29381617 DOI: 10.1097/scs.0000000000004234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVE Surgical operation within the region of the jugular foramen presents a great challenge. The authors characterized the quantitative impact of surgical window parameters on the exposure of the jugular foramen via a trans-mastoidal approach. METHODS Computed tomography and magnetic resonance imaging data were used to establish a 3-dimensional model of the jugular foramen region. The mastoidale, posterior edge of the mastoid, and the superior edge of the bony external acoustic meatus were selected as points a, b, and c. The anterior edge of the tuberculum jugulare was selected as point d. The midpoints of line segments ab, ac, and bc were selected as points e, f, and g. Triangle abc was divided into triangles aef, beg, cfg, and efg. Surgical corridors of the triangular pyramid were outlined by connecting the above triangles to point d. Anatomic exposure was evaluated by measuring the area and volume of various structures within each route. Statistical comparisons were performed via analysis of variance. RESULTS The model allowed for adequate visualization of all structures. The areas of triangles beg and efg were greater than those of triangles aef and cfg (P < 0.05). The volumes of triangular pyramids d-beg and d-cfg were greater than those of triangular pyramids d-aef and d-efg (P = 0.000). Statistically significant differences were also observed for volumes of osseous, venous, and cranial nerve structures in all divided routes (P = 0.000). CONCLUSION Our results indicate that 3-dimensional modeling may aid in the quantification of surgical exposure and that division of the craniotomy window may allow for more precise operation.
Collapse
|
30
|
Komune N, Matsuo S, Miki K, Akagi Y, Kurogi R, Iihara K, Nakagawa T. Surgical Anatomy of the Eustachian Tube for Endoscopic Transnasal Skull Base Surgery: A Cadaveric and Radiologic Study. World Neurosurg 2018; 112:e172-e181. [PMID: 29325963 DOI: 10.1016/j.wneu.2018.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2017] [Revised: 12/29/2017] [Accepted: 01/03/2018] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The endoscopic endonasal approach to the anatomically complex lateral skull base presents technical challenges. The use of the eustachian tube as a landmark to identify the petrous internal carotid artery has recently been reported, and this study aims to define the anatomic relationship between the eustachian tube and its surrounding structures using cadaveric dissection and radiologic analysis. METHODS To clarify the relationship of the eustachian tube with its surrounding structures, we performed endoscopic and microscopic dissection of 4 adult cadaveric heads and analyzed computed topography scans from 20 patients. RESULTS The eustachian tube is divided into the osseous and cartilaginous parts. The cartilaginous part can be further subdivided into the posterolateral, middle, and anteromedial parts, based on its relationship to the skull base. The eustachian tube is closely related to the pterygoid process of the sphenoid bone, the foramen lacerum, and the petrosal apex and is directed away from the oblique sagittal plane almost parallel to the vidian canal at 12.2° ± 6.2° (mean ± standard deviation). The relationship between the course of the vidian canal and the eustachian tube can aid the estimation of the anatomic course of the horizontal segment of the petrous carotid artery. CONCLUSIONS The eustachian tube is a useful landmark for predicting the course of the internal carotid artery when accessing the lateral skull base regions via an endonasal route. A profound understanding of the relationship between the eustachian tube and the surrounding skull base structures is important for endoscopic endonasal skull base surgeries.
Collapse
Affiliation(s)
- Noritaka Komune
- Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
| | - Satoshi Matsuo
- Department of Neurosurgery, Clinical Research Institute, National Hospital Organization, Kyushu Medical Center, Fukuoka, Japan
| | - Koichi Miki
- Department of Neurosurgery, Graduate School of Medical Sciences, Fukuoka University, Fukuoka, Japan
| | - Yojiro Akagi
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Ryota Kurogi
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Koji Iihara
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Takashi Nakagawa
- Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| |
Collapse
|
31
|
Oyama K, Tahara S, Hirohata T, Ishii Y, Prevedello DM, Carrau RL, Froelich S, Teramoto A, Morita A, Matsuno A. Surgical Anatomy for the Endoscopic Endonasal Approach to the Ventrolateral Skull Base. Neurol Med Chir (Tokyo) 2017; 57:534-541. [PMID: 28845040 PMCID: PMC5638780 DOI: 10.2176/nmc.ra.2017-0039] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The authors describe the surgical anatomy for the endoscopic endonasal approach (EEA) to the ventrolateral skull base. The ventrolateral skull base can be divided into two segments: the upper lateral and lower lateral skull base. The upper lateral skull base includes the cavernous sinus and the orbit, while the lower lateral skull base includes the petrous apex, Meckel's cave, parapharyngeal space, infratemporal fossa, etc. To gain access to the upper lateral skull base, a simple opening of the ethmoid sinus provides sufficient exposure of this area. To reach the lower lateral skull base, a transpterygoid approach, following ethmoidectomy, is a key procedure providing wide exposure of this area. Understanding of surgical anatomy is mandatory for treating ventrolateral skull base lesions via EEA. An appropriate, less-invasive approach should be applied depending on the size, location, and type of lesion.
Collapse
Affiliation(s)
- Kenichi Oyama
- Department of Neurosurgery, Pituitary & Endoscopic Surgery Center, Teikyo University School of Medicine
| | | | - Toshio Hirohata
- Department of Neurosurgery, Pituitary & Endoscopic Surgery Center, Teikyo University School of Medicine
| | - Yudo Ishii
- Department of Neurosurgery, Pituitary & Endoscopic Surgery Center, Teikyo University School of Medicine
| | | | - Ricardo L Carrau
- Department of Otolaryngology/Head & Neck Surgery, the Ohio State University
| | - Sebastien Froelich
- Department of Neurosurgery, Lariboisière Hospital, Paris VII-Diderot University
| | - Akira Teramoto
- Japan Labor Health and Safety Organization, Tokyo Rosai Hospital
| | - Akio Morita
- Department of Neurological Surgery, Nippon Medical School
| | - Akira Matsuno
- Department of Neurosurgery, Pituitary & Endoscopic Surgery Center, Teikyo University School of Medicine
| |
Collapse
|
32
|
Freeman JL, Sampath R, Quattlebaum SC, Casey MA, Folzenlogen ZA, Ramakrishnan VR, Youssef AS. Expanding the endoscopic transpterygoid corridor to the petroclival region: anatomical study and volumetric comparative analysis. J Neurosurg 2017; 128:1855-1864. [PMID: 28731399 DOI: 10.3171/2017.1.jns161788] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The endoscopic endonasal transmaxillary transpterygoid (TMTP) approach has been the gateway for lateral skull base exposure. Removal of the cartilaginous eustachian tube (ET) and lateral mobilization of the internal carotid artery (ICA) are technically demanding adjunctive steps that are used to access the petroclival region. The gained expansion of the deep working corridor provided by these maneuvers has yet to be quantified. METHODS The TMTP approach with cartilaginous ET removal and ICA mobilization was performed in 5 adult cadaveric heads (10 sides). Accessible portions of the petrous apex were drilled during the following 3 stages: 1) before ET removal, 2) after ET removal but before ICA mobilization, and 3) after ET removal and ICA repositioning. Resection volumes were calculated using 3D reconstructions generated from thin-slice CT scans obtained before and after each step of the dissection. RESULTS The average petrous temporal bone resection volumes at each stage were 0.21 cm3, 0.71 cm3, and 1.32 cm3 (p < 0.05, paired t-test). Without ET removal, inferior and superior access to the petrous apex was limited. Furthermore, without ICA mobilization, drilling was confined to the inferior two-thirds of the petrous apex. After mobilization, the resection was extended superiorly through the upper extent of the petrous apex. CONCLUSIONS The transpterygoid corridor to the petroclival region is maximally expanded by the resection of the cartilaginous ET and mobilization of the paraclival ICA. These added maneuvers expanded the deep window almost 6 times and provided more lateral access to the petroclival region with a maximum volume of 1.5 cm3. This may result in the ability to resect small-to-moderate sized intradural petroclival lesions up to that volume. Larger lesions may better be approached through an open transcranial approach.
Collapse
Affiliation(s)
| | | | | | | | | | | | - A Samy Youssef
- Departments of1Neurosurgery and.,2Otolaryngology, University of Colorado, Aurora, Colorado
| |
Collapse
|
33
|
Hasegawa H, Shin M, Kondo K, Hanakita S, Mukasa A, Kin T, Saito N. Role of endoscopic transnasal surgery for skull base chondrosarcoma: a retrospective analysis of 19 cases at a single institution. J Neurosurg 2017; 128:1438-1447. [PMID: 28686110 DOI: 10.3171/2017.1.jns162000] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Skull base chondrosarcoma is one of the most intractable tumors because of its aggressive biological behavior and involvement of the internal carotid artery and cranial nerves (CNs). One of the most accepted treatment strategies for skull base chondrosarcoma has been surgical removal of the tumor in conjunction with proactive extensive radiation therapy (RT) to the original tumor bed. However, the optimal strategy has not been determined. The goal of this study was to evaluate the early results of endoscopic transnasal surgery (ETS). METHODS The authors retrospectively analyzed 19 consecutive patients who underwent ETS at their institution since 2010. Adjuvant stereotactic radiosurgery (SRS) was performed only for the small residual tumors that were not resected to avoid critical neurological complications. Histological confirmation and evaluation of the MIB-1 index was performed in all cases. The Kaplan-Meier method was used to determine the actuarial rate of tumor-free survival. RESULTS The median tumor volume and maximal diameter were 14.5 cm3 (range 1.4-88.4 cm3) and 3.8 cm (range 1.5-6.7 cm), respectively. Nine patients (47%) had intradural extension of the tumor. Gross-total resection was achieved in 15 (78.9%) of the 19 patients, without any disabling complications. In 4 patients, the surgery resulted in subtotal (n = 2, 11%) or partial (n = 2, 11%) resection because the tumors involved critical structures, including the basilar artery or the lower CNs. These 4 patients were additionally treated with SRS. The median follow-up duration was 47, 28, and 27 months after the diagnosis, ETS, and SRS, respectively. In 1 patient with an anterior skull base chondrosarcoma, the tumor relapsed in the optic canal 1 year later and was treated with a second ETS. Favorable tumor control was achieved in all other patients. The actuarial tumor control rate was 93% at 5 years. At the final follow-up, all patients were alive and able to perform independent activities of daily living without continuous neurological sequelae. CONCLUSIONS These preliminary results suggest that ETS can achieve sufficient radical tumor removal, resulting in comparative resection rates with fewer neurological complications to those in previous reports. Although the follow-up periods of these cases were relatively short, elective SRS to the small tumor remnant may be rational, achieving successful tumor control in some cases, instead of using proactive extensive RT. Thus, the addition of RT should be discussed with each patient, after due consideration of histological grading and biological behavior. To determine the efficacy of this strategy, a larger case series with a longer follow-up period is essential. However, this strategy may be able to establish evidence in the management of skull base chondrosarcoma, providing less-invasive and effective options as an initial step of treatment.
Collapse
Affiliation(s)
| | | | - Kenji Kondo
- 2Otorhinolaryngology, University of Tokyo Hospital, Tokyo, Japan
| | | | | | | | | |
Collapse
|
34
|
Pérez de San Román-Mena L, Simal-Julián JA, Miranda-Lloret P, Sanromán-Álvarez P, Botella-Asunción C. Radiological Study of the Carotid-Clival Window and Its Application in Endoscopic Endonasal Expanded Approaches. World Neurosurg 2017; 104:356-360. [PMID: 28526643 DOI: 10.1016/j.wneu.2017.05.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 05/05/2017] [Accepted: 05/06/2017] [Indexed: 11/15/2022]
Abstract
BACKGROUND The surgical approach to the petrous apex (PA) and petroclival junction (PCJ) remains a challenge. The carotid-clival window (CCW) represents the widest window available to approach the PCJ from a mediolateral endoscopic route. Here we define the CCW radiologically in nonpathological conditions, to establish the anatomic variability of the PCJ, relate this variability to pneumatization patterns, and evaluate some technical concerns conditioned by the CCW. METHODS This was an analytical study of 10 multislice computed tomography scans from patients without SB pathology. Bilateral measures were taken at the roof and floor levels of the lacerum canal (LC) and its posterior projection over the PCJ (segments DE and QR). All measures were compared across different pneumatization patterns. RESULTS The DE and QR lengths were found to be the most important measures affecting the width of the CCW. Wide variability was observed, with a mean DE length of 8.52 mm (range, 2.4-12.8 mm) at the LC floor level and a mean QR length of 9.11 mm (range, 4.3-13.1 mm) at the LC roof level. The presence of retrocarotid pneumatization was statistically significantly associated with longer DE and QR segments. No differences were found among other pneumatization patterns. CONCLUSIONS The CCW varies widely among individuals. The presence of pneumatization behind the paraclival carotid represents an advantageous characteristic when planning an endoscopic approach to the PCJ.
Collapse
Affiliation(s)
| | | | - Pablo Miranda-Lloret
- Department of Neurosurgery, Hospital U. i P. La Fe. Fernando Abril Martorell, Valencia, Spain
| | - Pablo Sanromán-Álvarez
- Department of Neurosurgery, Hospital U. i P. La Fe. Fernando Abril Martorell, Valencia, Spain
| | - Carlos Botella-Asunción
- Department of Neurosurgery, Hospital U. i P. La Fe. Fernando Abril Martorell, Valencia, Spain
| |
Collapse
|