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Misra D, Kumar A, Joseph L. The Displacement Patterns of Petrous Internal Carotid Artery and Its Morphometric Relations with Vidian Canal in Petroclival Chondrosarcomas Relevant to Extended Endoscopic Endonasal Approaches: A Radiological Study. World Neurosurg 2024; 185:e1049-e1056. [PMID: 38484969 DOI: 10.1016/j.wneu.2024.03.020] [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: 02/17/2024] [Revised: 03/04/2024] [Accepted: 03/05/2024] [Indexed: 04/14/2024]
Abstract
BACKGROUND Extended endoscopic endonasal approaches (EEAs) to petroclival chondrosarcomas (PCs) require a thorough understanding of skullbase anatomy, especially the anatomy of petrous internal carotid artery (pICA), as ICA injury is the most dreaded complication of extended EEAs. We conducted this study to determine the displacement patterns of pICA in patients with PCs. METHODS Contrast enhanced computed tomography scan and angiography images of patients with PCs were analyzed for following parameters-antero-posterior, cranio-caudal, medio-lateral, and direct distances between anterior genu of petrous internal carotid artery (AGpICA) and posterior end of Vidian canal (pVC). pICA encasement/narrowing by tumor was noted on magnetic resonance imaging. RESULTS We studied 11 patients with histopathologically proven PCs. pICA encasement/narrowing and pVC destruction were observed in one patient each. The mean antero-posterior and cranio-caudal distances on tumor side/normal side were 7.7 ± 1.9/6.4 ± 1.0 mm & 4.5 ± 1.5/3.4 ± 0.9 mm, respectively. The overall displacement was posterior & superior. Medio-lateral displacement was seen in 4 patients (lateral in 3 and medial in 1). In rest, AGpICA was centered on pVC. The mean direct distance was 9.4 ± 2.5 mm. In 3 patients with displacement seen in all three axes, direct distance was measured by the "cuboid method." Overall, posterior-superior-lateral, posterior-superior, and anterior-inferior were the common displacement patterns of AGpICA relative to pVC. CONCLUSIONS The displacement patterns of AGpICA in PCs are variable. An individualized approach with meticulous analysis of preoperative imaging can help in determining the relation between AGpICA and pVC. This detailed morphometric information can facilitate better orientation to altered anatomy, which can be helpful in preventing pICA injury during extended EEAs.
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Affiliation(s)
- Devnandan Misra
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India
| | - Amandeep Kumar
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India.
| | - Leve Joseph
- Department of Neuroradiology, All India Institute of Medical Sciences, New Delhi, India
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Cinibulak Z, Poggenborg J, Schliwa S, Al-Afif S, Ostovar N, Krauss JK, Nakamura M. Assessing the feasibility of the transmastoid infralabyrinthine approach without decompression of the jugular bulb to the extradural part of the petrous apex and petroclival junction prior to surgery. Acta Neurochir (Wien) 2024; 166:151. [PMID: 38530445 DOI: 10.1007/s00701-024-06044-8] [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: 12/04/2023] [Accepted: 03/12/2024] [Indexed: 03/28/2024]
Abstract
BACKGROUND AND OBJECTIVE This study aims to define specific measurements on cranial high-resolution computed tomography (HRCT) images prior to surgery to prove the feasibility of the navigated transmastoid infralabyrinthine approach (TI-A) without rerouting of the facial nerve (FN) and decompression of the jugular bulb (JB) in accessing the extradural-intrapetrous part of petrous bone lesions located at the petrous apex and petroclival junction. MATERIALS AND METHODS Vertical and horizontal distances of the infralabyrinthine space were measured on cranial HRCT images prior to dissection. Subsequently, the area of access was measured on dissected human cadaveric specimens. Infralabyrinthine access to the extradural part of the petrous apex and petroclival junction was evaluated on dissected specimens by two independent raters. Finally, the vertical and horizontal distances were correlated with the area of access. RESULTS Fourteen human cadaveric specimens were dissected bilaterally. In 54% of cases, the two independent raters determined appropriate access to the petrous apex and petroclival junction. A highly significant positive correlation (r = 0.99) was observed between the areas of access and the vertical distances. Vertical distances above 5.2 mm were considered to permit suitable infralabyrinthine access to the extradural area of the petrous apex and petroclival junction. CONCLUSIONS Prior to surgery, vertical infralabyrinthine distances on HRCT images above 5.2 mm provide suitable infralabyrinthine access to lesions located extradurally at the petrous apex and petroclival junction via the TI-A without rerouting of the FN and without decompression of the JB.
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Affiliation(s)
- Zafer Cinibulak
- Department of Neurosurgery, Merheim Hospital, Ostmerheimer Str. 200, 51109, Cologne, Germany.
- Faculty of Health, Herdecke University, WittenWitten, Germany.
| | - Jörg Poggenborg
- Department of Radiology, Merheim Hospital, Cologne, Germany
- Faculty of Health, Herdecke University, WittenWitten, Germany
| | - Stefanie Schliwa
- Institute of Anatomy, Anatomy and Cell Biology, University of Bonn, Bonn, Germany
| | - Shadi Al-Afif
- Department of Neurosurgery, Hannover Medical School, Hannover, Germany
| | - Nima Ostovar
- Department of Neurosurgery, Merheim Hospital, Ostmerheimer Str. 200, 51109, Cologne, Germany
- Faculty of Health, Herdecke University, WittenWitten, Germany
| | - Joachim K Krauss
- Department of Neurosurgery, Hannover Medical School, Hannover, Germany
| | - Makoto Nakamura
- Department of Neurosurgery, Merheim Hospital, Ostmerheimer Str. 200, 51109, Cologne, Germany
- Faculty of Health, Herdecke University, WittenWitten, Germany
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Rennert RC, Budohoski KP, Mortimer VR, Couldwell WT. Combined and staged retrosigmoid, extended middle fossa, and endoscopic transnasal approach to a petroclival chondrosarcoma: how I do it. Acta Neurochir (Wien) 2023; 165:3455-3459. [PMID: 37572206 DOI: 10.1007/s00701-023-05749-6] [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: 05/19/2023] [Accepted: 07/31/2023] [Indexed: 08/14/2023]
Abstract
BACKGROUND Tumors of the petroclival region with multicompartment extension can be difficult to address with a single surgical approach. METHOD We present the case of a patient with a large chondrosarcoma centered at the right petroclival fissure with extension into the cavernous sinus, the region beneath the cavernous sinus, cerebellopontine angle with deformation of the pons, and prevertebral space. A staged complete resection was performed using a stage 1 single-incision combined right retrosigmoid craniotomy and extended middle fossa craniotomy, followed by a stage 2 endoscopic transnasal approach. CONCLUSION A combined approach to selected petroclival tumors can maximize safe resection.
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Affiliation(s)
- Robert C Rennert
- Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, 175 N. Medical Drive East, Salt Lake City, UT, 84132, USA
| | - Karol P Budohoski
- Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, 175 N. Medical Drive East, Salt Lake City, UT, 84132, USA
| | - Vance R Mortimer
- Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, 175 N. Medical Drive East, Salt Lake City, UT, 84132, USA
| | - William T Couldwell
- Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, 175 N. Medical Drive East, Salt Lake City, UT, 84132, USA.
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Meier L, Rajan G. Chondrosarcoma of the petrous apex with nerve abducens involvement in a woman with pre-existing contralateral amblyopia. BMJ Case Rep 2023; 16:e256273. [PMID: 37730429 PMCID: PMC10514603 DOI: 10.1136/bcr-2023-256273] [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] [Accepted: 08/14/2023] [Indexed: 09/22/2023] Open
Abstract
We report about a case of a woman in her 50s with a chondrosarcoma of the petrous apex. She has a strabism due to a right-sided amblyopia since childhood and noticed a slowly progressive squint angle in the last months. Her general practitioner (GP) referred her to an ophthalmologist who diagnosed a left abducens paresis and initiated an MRI demonstrating a mass in the left petrous apex. A transnasal endoscopic transsphenoidal biopsy revealed a grade I chondrosarcoma. The patient underwent an endoscopic transsphenoidal anterior petrosectomy approach with complete removal of the tumour. After surgery the squint angle gradually improved to previous levels, so that the patient was able to resume her work. This report demonstrates that even slight changes of a squint angle without diplopia, in this case because of pre-existing amblyopia, could be a hallmark of an intracranial process.
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Affiliation(s)
- Letizia Meier
- Klinik für Hals-, Nasen-, Ohren- und Gesichtschirurgie, Luzerner Kantonsspital, Luzern, Switzerland
| | - Gunesh Rajan
- Klinik für Hals-, Nasen-, Ohren- und Gesichtschirurgie, Luzerner Kantonsspital, Luzern, Switzerland
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Gersey ZC, Zenonos GA, Gardner PA. Malignant Brain and Spinal Tumors Originating from Bone or Cartilage. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1405:477-506. [PMID: 37452950 DOI: 10.1007/978-3-031-23705-8_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Malignant bone tumors affecting the brain and spine are a rare and exceedingly difficult-to-treat group of diseases. Most commonly consisting of chordoma and chondrosarcoma, these tumors also include giant-cell tumors and osteosarcomas. This chapter will cover the background, epidemiology, genetics, molecular biology, histopathology, radiographic features, clinical manifestations, therapeutic approaches, and clinical management of each entity.
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Affiliation(s)
- Zachary C Gersey
- Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Georgios A Zenonos
- Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Paul A Gardner
- UPMC Center for Cranial Base Surgery, 200 Lothrop Street, PUH B-400, Pittsburgh, PA, 15213, USA.
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Kawashima M, Shin M, Jokura H, Hasegawa T, Yamanaka K, Yamamoto M, Matsunaga S, Akabane A, Yomo S, Onoue S, Kondoh T, Hasegawa H, Shinya Y, Saito N. Outcomes of Gamma Knife radiosurgery for skull base chondrosarcomas: a multi-institutional retrospective study. J Neurosurg 2022; 137:969-976. [PMID: 35180704 DOI: 10.3171/2022.1.jns212703] [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: 12/01/2021] [Accepted: 01/07/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Radiotherapy has an essential role in the management of skull base chondrosarcomas (SBCs) after resection. This multi-institutional study evaluated the outcomes of Gamma Knife radiosurgery (GKRS) for histopathologically proven SBCs. METHODS Data of patients who underwent GKRS for SBCs at Gamma Knife centers in Japan were retrospectively collected. Patients without a histopathological diagnosis and those who had intracranial metastases from extracranial chondrosarcomas were excluded. Histologically, grade III and some nonconventional variants were identified as aggressive types. The cumulative local control rates (LCRs) and disease-specific survival (DSS) rates were calculated using the Kaplan-Meier method. Factors potentially affecting the LCR were evaluated using the Cox proportional hazards model for bivariate and multivariate analyses. The incidence of radiation-induced adverse effects (RAEs) was calculated as crude rates, and factors associated with RAEs were examined using Fisher's exact test. RESULTS Fifty-one patients were enrolled, with a median age of 38 years. Thirty patients (59%) were treated with upfront GKRS for residual SBCs after resection (n = 27) or biopsy (n = 3), and 21 (41%) underwent GKRS as a salvage treatment for recurrence. The median tumor volume was 8 cm3. The overall LCRs were 87% at 3 years, 78% at 5 years, and 67% at 10 years after GKRS. A better LCR was associated with a higher prescription dose (p = 0.039) and no history of repeated recurrence before GKRS (p = 0.024). The LCRs among patients with the nonaggressive histological type and treatment with ≥ 16 Gy were 88% at 3 years, 83% at 5 years, and 83% at 10 years. The overall survival rates after GKRS were 96% at 5 years and 83% at 10 years. Although RAEs were observed in 3 patients (6%), no severe RAEs with Common Terminology Criteria for Adverse Events grade 3 or higher were identified. No significant factor was associated with RAEs. CONCLUSIONS GKRS for SBCs has a favorably low risk of RAEs and could be a reasonable therapeutic option for SBC in multimodality management. A sufficient GKRS prescription dose is necessary for higher LCRs. Histological grading and subtype evaluations are important for excluding exceptional SBCs. Patients with conventional SBCs have a long life expectancy and should be observed for life after treatment.
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Affiliation(s)
- Mariko Kawashima
- 1Department of Neurosurgery, The University of Tokyo Hospital, Tokyo
| | - Masahiro Shin
- 1Department of Neurosurgery, The University of Tokyo Hospital, Tokyo
| | - Hidefumi Jokura
- 2Jiro Suzuki Memorial Gamma House, Furukawa Seiryo Hospital, Osaki, Miyagi
| | - Toshinori Hasegawa
- 3Department of Neurosurgery, Gamma Knife Center, Komaki City Hospital, Komaki, Aichi
| | | | | | - Shigeo Matsunaga
- 6Department of Neurosurgery and Stereotactic Radiotherapy Center, Yokohama Rosai Hospital, Yokohama, Kanagawa
| | | | - Shoji Yomo
- 8Division of Radiation Oncology, Aizawa Comprehensive Cancer Center, Aizawa Hospital, Matsumoto, Nagano
| | - Shinji Onoue
- 9Department of Neurosurgery, Ehime Prefectural Central Hospital, Matsuyama, Ehime
| | - Takeshi Kondoh
- 10Department of Neurosurgery, Shinsuma General Hospital, Kobe, Hyogo, Japan
| | - Hirotaka Hasegawa
- 1Department of Neurosurgery, The University of Tokyo Hospital, Tokyo
| | - Yuki Shinya
- 1Department of Neurosurgery, The University of Tokyo Hospital, Tokyo
| | - Nobuhito Saito
- 1Department of Neurosurgery, The University of Tokyo Hospital, Tokyo
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Localisation of the petrous internal carotid artery relative to the vidian canal on computed tomography: a case-control study evaluating the impact of petroclival chondrosarcoma. Acta Neurochir (Wien) 2022; 164:1939-1948. [PMID: 35612666 PMCID: PMC9233644 DOI: 10.1007/s00701-022-05254-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 05/13/2022] [Indexed: 11/11/2022]
Abstract
Background The vidian canal (VC) is normally a reliable anatomical landmark for locating the petrous internal carotid artery (pICA). This study determined the influence of petroclival chondrosarcoma on the relationship between the VC and pICA. Methods Nine patients (3 males, 6 females; median age 49) with petroclival chondrosarcoma, and depiction of the pICA on contrast-enhanced CT, were retrospectively studied. CT-based measurements were performed by two observers, both in the presence of the petroclival chondrosarcoma (case) and on the contralateral control side. The antero-posterior (AP) and craniocaudal (CC) measurements from the posterior VC to the pICA, whether the pICA was in the trajectory of the VC, and the coronal relationship of the pICA anterior genu with the VC were recorded. Results Chondrosarcoma usually displaced the pICA anteriorly (8/9 cases) and superiorly (6/9 cases) relative to the normal side with mean AP and CC measurements of 3.9 mm v 7.2 mm (p = 0.054) and 4.4 mm v 1.4 mm (p = 0.061). The VC trajectory less frequently intersected the pICA cross-section in the presence of chondrosarcoma however it was in the line of the eroded dorsal VC in one case. The anterior genu of the pICA was displaced more laterally by chondrosarcoma but usually remained superior to the VC. Conclusion Petroclival chondrosarcoma variably influences the anatomical relationship between the VC and the pICA, hence requiring an individualised approach. The pICA is usually anterosuperiorly displaced, and the anterior genu remains superior to the VC, however it may be located in the line of the canal.
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Primary Skull Base Chondrosarcomas: A Systematic Review. Cancers (Basel) 2021; 13:cancers13235960. [PMID: 34885071 PMCID: PMC8656924 DOI: 10.3390/cancers13235960] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 11/23/2021] [Accepted: 11/25/2021] [Indexed: 12/19/2022] Open
Abstract
Simple Summary Primary skull base chondrosarcomas (SBCs) may carry significant tumor-burden by causing severe cranial nerve neuropathies. Current treatment strategies mainly focus on surgical resection and radiotherapy protocols, with a wide range of findings in terms of efficacy and safety. The aim of our systematic review was to comprehensively analyze the current literature on primary SBCs, describing clinical and radiological characteristics, available management strategies, treatment outcomes, and prognoses. We found that most primary SBCs show benign slow-growing patterns but may cause neurological deficits by compressing critical neurovascular structures. Open surgical approaches favor maximal resection with acceptable complication rates, but only a few studies reported the use of newer endoscopic approaches. Proton-based, photon-based, and carbon-based radiotherapy protocols may also allow safe and effective local tumor control as adjuvant treatments or stand-alone strategies in patients not eligible to undergo surgery. Overall, primary SBCs’ prognoses proved to be favorable and comparable to benign skull base neoplasms. Abstract Background: Primary skull base chondrosarcomas (SBCs) can severely affect patients’ quality of life. Surgical-resection and radiotherapy are feasible but may cause debilitating complications. We systematically reviewed the literature on primary SBCs. Methods: PubMed, EMBASE, Scopus, Web-of-Science, and Cochrane were searched following the PRISMA guidelines to include studies of patients with primary SBCs. Clinical characteristics, management strategies, and treatment outcomes were analyzed. Results: We included 33 studies comprising 1307 patients. Primary SBCs mostly involved the middle-fossa (72.7%), infiltrating the cavernous-sinus in 42.4% of patients. Cranial-neuropathies were reported in 810 patients (62%). Surgical-resection (93.3%) was preferred over biopsy (6.6%). The most frequent open surgical approaches were frontotemporal-orbitozygomatic (17.6%) and pterional (11.9%), and 111 patients (21.3%) underwent endoscopic-endonasal resection. Post-surgical cerebrospinal-fluid leaks occurred in 36 patients (6.5%). Radiotherapy was delivered in 1018 patients (77.9%): photon-based (41.4%), proton-based (64.2%), and carbon-based (13.1%). Severe post-radiotherapy complications, mostly hypopituitarism (15.4%) and hearing loss (7.1%) were experienced by 251 patients (30.7%). Post-treatment symptom-improvement (46.7%) and reduced/stable tumor volumes (85.4%) showed no differences based on radiotherapy-protocols (p = 0.165; p = 0.062). Median follow-up was 67-months (range, 0.1–376). SBCs recurrences were reported in 211 cases (16.1%). The 5-year and 10-year progression-free survival rates were 84.3% and 67.4%, and overall survival rates were 94% and 84%. Conclusion: Surgical-resection and radiotherapy are effective treatments in primary SBCs, with acceptable complication rates and favorable local tumor control.
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Bawornvaraporn U, Zomorodi AR, Friedman AH, Fukushima T. Neurosurgical management of petrous bone lesions: classification system and selection of surgical approaches. Acta Neurochir (Wien) 2021; 163:2895-2907. [PMID: 34313854 DOI: 10.1007/s00701-021-04934-9] [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: 12/15/2020] [Accepted: 06/29/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND Surgery of petrous bone lesions (PBLs) is challenging for neurosurgeons. Selection of the surgical approach is an important key for success. In this study, the authors present an anatomical classification for PBLs that has been used by our group for over the past 26 years. The objective of this study is to investigate the benefits and applicability of this classification. METHODS Between 1994 and 2019, 117 patients treated for PBLs were retrospectively reviewed. Using the V3 and arcuate eminence as reference points, the petrous bone is segmented into 3 parts: petrous apex, rhomboid, and posterior. The pathological diagnoses, selection of the operative approach, and the extent of resection (EOR) were analyzed and correlated using this classification. RESULTS This series included 22 facial nerve schwannomas (18.8%), 22 cholesterol granulomas (18.8%), 39 chordomas/chondrosarcomas (33.3%), 6 trigeminal schwannomas (5.1%), 13 epidermoids/dermoids (11.1%), and 15 other pathologies (12.8%). PBLs were most often involved with the petrous apex and rhomboid areas (46.2%). The extradural subtemporal approach (ESTA) was most frequently used (57.3%). Gross total resection was achieved in 58.4%. Symptomatic improvement occurred in 92 patients (78.6%). Our results demonstrated a correlation between this classification with each type of pathology (p < .001), selection of surgical approaches (p < 0.001), and EOR (p = 0.008). Chordoma/chondrosarcoma, redo operations, and lesions located medially were less likely to have total resection. Temporary complications occurred in 8 cases (6.8%), persistent morbidity in 5 cases (4.3%), and mortality in 1 case. CONCLUSION In this study, we proposed a simple classification of PBLs. Using landmarks on the superior petrosal surface, the petrous bone is divided into 3 parts, apex, rhomboid, and posterior. Our results demonstrated that chordoma/chondrosarcoma, redo operations, and lesions involving the tip of the petrous apex or far medial locations were more difficult to achieve total resection. This classification could help surgeons understand surgical anatomy framework, predict possible structures at risk, and select the most appropriate approach for each patient.
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Affiliation(s)
- Udom Bawornvaraporn
- Division of Neurosurgery, Duke University Medical Center, Durham, NC, USA.
- Division of Neurosurgery, Department of Surgery, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Bangkok, 10330, Thailand.
| | - Ali R Zomorodi
- Division of Neurosurgery, Duke University Medical Center, Durham, NC, USA
| | - Allan H Friedman
- Division of Neurosurgery, Duke University Medical Center, Durham, NC, USA
| | - Takanori Fukushima
- Division of Neurosurgery, Duke University Medical Center, Durham, NC, USA
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Hasegawa H, Vakharia K, Graffeo CS, Carlson ML, Pollock BE, Brown PD, Perry A, Van Gompel JJ, Driscoll CLW, Link MJ. Long-term outcomes of grade I/II skull base chondrosarcoma: an insight into the role of surgery and upfront radiotherapy. J Neurooncol 2021; 153:273-281. [PMID: 33907967 DOI: 10.1007/s11060-021-03764-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 04/20/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE To clarify the need for post-operative radiation treatment in skull base chondrosarcomas (SBCs). METHODS A retrospective analysis of patients with grade I or II SBC. Patients were divided according to post-surgical treatment strategies: (A) planned upfront radiotherapy and (B) watchful waiting. Tumor control and survival were compared between the treatment groups. The median follow-up after resection was 105 months (range, 9-376). RESULTS Thirty-two patients (Grade 1, n = 16; Grade 2, n = 16) were included. The most frequent location was petroclival (21, 64%). A gross total resection (GTR) was achieved in 11 patients (34%). Fourteen (44%) underwent upfront radiotherapy (group A) whereas 18 (56%) were followed with serial MRI alone (group B). The tumor control rate for the entire group was 77% and 69% at 10- and 15-year, respectively. Upfront radiotherapy (P = 0.25), extent of resection (P = 0.11) or tumor grade (P = 0.83) did not affect tumor control. The majority of Group B patients with recurrent tumors (5/7) obtained tumor control with repeat resection (n = 2), salvage radiotherapy (n = 2), or a combination of both (n = 1). The 10-year disease-specific survival was 95% with no difference between the group A and B (P = 0.50). CONCLUSION For patients with grade I/II SBC, a reasonable strategy is deferral of radiotherapy after maximum safe resection until tumor progression or recurrence. At that time, most patients can be successfully managed with salvage radiotherapy or surgery. Late recurrences may occur, and life-long follow-up is advisable.
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Affiliation(s)
- Hirotaka Hasegawa
- Departments of Neurologic Surgery, Mayo Clinic, Rochester, MN, USA.,Department of Neurosurgery, The University of Tokyo, Bunkyo, Tokyo, Japan
| | - Kunal Vakharia
- Departments of Neurologic Surgery, Mayo Clinic, Rochester, MN, USA
| | | | | | - Bruce E Pollock
- Departments of Neurologic Surgery, Mayo Clinic, Rochester, MN, USA
| | - Paul D Brown
- Departments of Radiation Oncology, Mayo Clinic, Rochester, MN, USA
| | - Avital Perry
- Departments of Neurologic Surgery, Mayo Clinic, Rochester, MN, USA
| | | | | | - Michael J Link
- Departments of Neurologic Surgery, Mayo Clinic, Rochester, MN, USA.
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Konovalov A, Shekhtman O, Shekhtman AP, Bezborodova T. Chondrosarcoma of the Skull Base: A Case Study and Literature Review. Cureus 2020; 12:e12412. [PMID: 33659104 PMCID: PMC7847484 DOI: 10.7759/cureus.12412] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Chondrosarcomas (CSs) are rare malignant tumors composed of cells derived from the transformed chondrocytes. Only 2% of the total cases of CS are found at the skull base, thus representing a 0.1-0.2% prevalence. We present the case of a patient with CS at the middle cranial fossa who was admitted for surgery to the Burdenko National Medical Research Center of Neurosurgery. In addition, we engage in a review of the literature to discuss the current approaches to the diagnostics and surgery of CS and delve deep into its embryo- and oncogenesis.
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Affiliation(s)
- Anton Konovalov
- Vascular Surgery, Burdenko Neurosurgical Center, Moscow, RUS
| | - Oleg Shekhtman
- Vascular Surgery, Burdenko National Medical Research Center for Neurosurgery, Moscow, RUS
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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: 80] [Impact Index Per Article: 20.0] [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.
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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
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Lopez-Gonzalez MA, Eastin TM, Ramanathan D, Minwoo S, Choudhury B. Combined petrosal approach for resection of petroclival chondrosarcoma: Microsurgical 2-D video. Surg Neurol Int 2020; 11:102. [PMID: 32782852 PMCID: PMC7265404 DOI: 10.25259/sni_121_2020] [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: 03/25/2020] [Accepted: 04/18/2020] [Indexed: 11/16/2022] Open
Abstract
Background: Petroclival lesions pose a significant neurosurgical challenge due to involvement or close proximity to important neurovascular structures. Chondrosarcomas are rare lesions that can affect these areas. Case Description: A 24-year-old male with 3 months history of poor coordination, imbalance, left-sided face hypoesthesia, facial palsy House-Brackmann Grade 2, and 6th cranial nerve palsy with diplopia. Hearing was preserved. Preoperative images showed a 5.5 cm multilobulated enhancing extra-axial mass centered in the left petroclival region with extension into middle and posterior fossa causing severe (Stage 3) brainstem compression.[1] After a lengthy discussion of treatment options, the patient consented for the procedure. We performed a presigmoid retrolabyrinthine combined petrosal approach. We used cranial nerves monitoring (VII, VIII, IX, X, XI, XII), frameless stereotaxy, and a lumbar drain. Due to the tumor size and location (petroclival region with extension into the posterior and middle cranial fossa), we chose this approach to achieve a maximal safe resection of the tumor and preserve hearing. Alternative approaches of use are expanded middle fossa with transcavernous extension or expanded endonasal approach. The selected approach achieved wide exposure of the tumor which was highly vascular. The tumor was carefully dissected off the brainstem, cranial nerves (IV, V, VI, VII, VIII), and basilar artery trunk. A gross total resection was achieved (Multimedia 1). The patient did well after surgery and was extubated on postoperative day (POD) 1 and the lumbar drain removed on POD 5. Pathology reported low-grade chondrosarcoma (WHO grade I). At 3 months follow-up, the patient improved neurologically, including facial nerve weakness (House-Brackmann Grade 1) except for his left 6th cranial nerve palsy which mildly improved. Conclusion: Petroclival chondrosarcomas are rare tumors that are usually treated with surgical resection followed by stereotactic radiosurgery. The tumor size, location, and extension dictate approach selection. For lesions involving the petroclival region with extension into the middle fossa and posterior fossa, the combined petrosal approach is reasonable.
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Affiliation(s)
- Miguel Angel Lopez-Gonzalez
- Department of Neurosurgery, School of Medicine, Loma Linda University, Loma Linda, California, United States
| | - Timothy Marc Eastin
- Department of Neurosurgery, School of Medicine, Loma Linda University, Loma Linda, California, United States
| | - Dinesh Ramanathan
- Department of Neurosurgery, School of Medicine, Loma Linda University, Loma Linda, California, United States
| | - Song Minwoo
- Department of Neurosurgery, School of Medicine, Loma Linda University, Loma Linda, California, United States
| | - Baishakhi Choudhury
- Department of Otolaryngology and Head and Neck Surgery, Loma Linda University, Loma Linda, California, United States
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Edem I, DeMonte F, Raza SM. Advances in the management of primary bone sarcomas of the skull base. J Neurooncol 2020; 150:393-403. [PMID: 32306199 DOI: 10.1007/s11060-020-03497-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 04/10/2020] [Indexed: 10/24/2022]
Abstract
Skull base primary malignancies represent a heterogeneous group of histologic diagnoses and sarcomas of the skull base are specific malignant tumors that arise from mesenchymal cells and can be classified by site of origin into bony and soft tissue sarcomas. The most common bony sarcomas include: chondrosarcoma, osteosarcoma, chordoma, Ewing's sarcoma. Given the relative rarity of each histologic diagnosis, especially in the skull base, there is limited published data to guide the management of patients with skull base sarcomas. An electronic search of the literature was performed to obtain key publications in the management of bony sarcomas of the skull base published within the last decade. This article is thus a review of the multi-disciplinary management principles of primary bony sarcomas of the skull base. Of note, there have been several recent advancements in the realm of skull base sarcoma management that have resulted in improved survival. These include advances in: imaging and diagnostic techniques, surgical techniques that incorporate oncologic surgical principles, conformal radiation paradigms and targeted systemic therapies. Early access to coordinated multi-disciplinary subspecialty care immediately at suspicion of diagnosis has further improved outcomes. There are several ongoing trials in the realms of radiation therapy and systemic therapy that will hopefully provide further insight about the optimal management of bony sarcomas of the skull base.
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Affiliation(s)
- Idara Edem
- Departments of Neurosurgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Franco DeMonte
- Departments of Neurosurgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Shaan M Raza
- Departments of Neurosurgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. .,Departments of Neurosurgery, The University of Texas MD Anderson Cancer Center, 1400 Holcombe Blvd, Rm FC7.2000, Unit 442, Houston, TX, 77030, USA.
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15
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Kaltsas GA, Kolomodi D, Randeva H, Grossman A. Nonneuroendocrine Neoplasms of the Pituitary Region. J Clin Endocrinol Metab 2019; 104:3108-3123. [PMID: 30779850 DOI: 10.1210/jc.2018-01871] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 02/14/2019] [Indexed: 12/18/2022]
Abstract
CONTEXT Although most sellar lesions are related to pituitary adenomas, the region gives rise to a variety of neoplasms that can be associated with substantial morbidity and/or mortality. DESIGN Information from reviews and guidelines of relevant societies dealing with such neoplasms, as well as articles that have provided new developments that made important contributions to their pathogenesis and treatment up to 2018, were obtained: public indexes such as PubMed/MEDLINE were used with the relevant search items. RESULTS Sellar neoplasms have a worse outcome than pituitary adenomas that is related not only to their natural history but also to side effects of therapies and evolving endocrine and/or hypothalamic deficiencies. Recent imaging advances have established the radiological fingerprint of some of these neoplasms, and several chromosomal aberrations have also been identified. Although established approaches along with new surgical and radiotherapeutic approaches remain the main treatment modalities, recent evidence has provided insight into their molecular pathogenesis involving, other than chemotherapy, treatments with targeted agents as in gliomas and craniopharyngiomas bearing BRAF mutations. Development of predictive markers of recurrences may also identify high-risk patients, including proliferative markers and expression of the progesterone receptor in meningiomas, and lead to less aggressive surgery. Owing to the rarity and complexity of these neoplasms, patients should be managed in dedicated centers. CONCLUSIONS The diagnosis and management of sellar neoplasms necessitate a multidisciplinary approach. Following evolving recent advances in their diagnosis and therapy, such a multidisciplinary approach needs to be extended to establish evidence-based diagnostic and management plans.
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Affiliation(s)
- Gregory A Kaltsas
- First Department of Propaedeutic Internal Medicine, National and Kapodistrian University of Athens, Athens, Greece
- WISDEM Centre, University Hospital of Coventry and Warwickshire, Coventry, United Kingdom
| | - Dionysia Kolomodi
- First Department of Propaedeutic Internal Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Harpal Randeva
- WISDEM Centre, University Hospital of Coventry and Warwickshire, Coventry, United Kingdom
| | - Ashley Grossman
- Centre for Endocrinology, Barts and the London School of Medicine, Queen Mary University of London, London, United Kingdom
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Simon F, Feuvret L, Bresson D, Guichard JP, El Zein S, Bernat AL, Labidi M, Calugaru V, Froelich S, Herman P, Verillaud B. Surgery and protontherapy in Grade I and II skull base chondrosarcoma: A comparative retrospective study. PLoS One 2018; 13:e0208786. [PMID: 30557382 PMCID: PMC6296545 DOI: 10.1371/journal.pone.0208786] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 11/26/2018] [Indexed: 11/19/2022] Open
Abstract
Objective Skull base chondrosarcoma is a rare tumour usually treated by surgery and proton therapy. However, as mortality rate is very low and treatment complications are frequent, a less aggressive therapeutic strategy could be considered. The objective of this study was to compare the results of surgery only vs surgery and adjuvant proton therapy, in terms of survival and treatment adverse effects, based on a retrospective series. Methods Monocentric retrospective study at a tertiary care centre. All patients treated for a skull base grade I and II chondrosarcoma were included. We collected data concerning surgical and proton therapy treatment and up-to-date follow-up, including Common Terminology Criteria for Adverse Events (CTCAE) scores. Results 47 patients (23M/24F) were operated on between 2002 and 2015; mean age at diagnosis was 47 years-old (10–85). Petroclival and anterior skull base locations were found in 34 and 13 patients, respectively. Gross total resection was achieved in 17 cases (36%) and partial in 30 (64%). Adjuvant proton therapy (mean total dose 70 GyRBE,1.8 GyRBE/day) was administered in 23 cases. Overall mean follow-up was 91 months (7–182). Of the patients treated by surgery only, 8 (34%) experienced residual tumour progression (mean delay 51 months) and 5 received second-line proton therapy. Adjuvant proton therapy was associated with a significantly lower rate of relapse (11%; p = 0.01). There was no significant difference in 10-year disease specific survival between patients initially treated with or without adjuvant proton therapy (100% vs 89.8%, p = 0.14). Difference in high-grade toxicity was not statistically significant between patients in both groups (25% (7) vs 11% (5), p = 0.10). The most frequent adverse effect of proton therapy was sensorineural hearing loss (39%). Conclusion Long-term disease specific survival was not significantly lower in patients without adjuvant proton therapy, but they experienced less adverse effects. We believe a surgery only strategy could be discussed, delaying as much as possible proton therapy in cases of relapse. Further prospective studies are needed to validate this more conservative strategy in skull base chondrosarcoma.
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Affiliation(s)
- François Simon
- AP-HP, Hôpital Lariboisière, Department of Otorhinolaryngology and Paris Diderot University, Paris, France
- * E-mail:
| | - Loïc Feuvret
- AP-HP, Hôpital Pitié-Salpêtrière, Department of Radiation Oncology and Pierre et Marie Curie University, Paris, France
- Institut Curie-Centre de protonthérapie d’Orsay, Department of Radiation Oncology and INSERM U61, Centre Universitaire, Orsay, France
| | - Damien Bresson
- AP-HP, Hôpital Lariboisière, Department of Neurosurgery and Paris Diderot University, Paris, France
| | - Jean-Pierre Guichard
- AP-HP, Hôpital Lariboisière, Department of Radiology and Paris Diderot University, Paris, France
| | - Sophie El Zein
- AP-HP, Hôpital Lariboisière, Department of Pathology and Paris Diderot University, Paris, France
| | - Anne-Laure Bernat
- AP-HP, Hôpital Lariboisière, Department of Neurosurgery and Paris Diderot University, Paris, France
| | - Moujahed Labidi
- AP-HP, Hôpital Lariboisière, Department of Neurosurgery and Paris Diderot University, Paris, France
| | - Valentin Calugaru
- Institut Curie-Centre de protonthérapie d’Orsay, Department of Radiation Oncology and INSERM U61, Centre Universitaire, Orsay, France
| | - Sébastien Froelich
- AP-HP, Hôpital Lariboisière, Department of Neurosurgery and Paris Diderot University, Paris, France
| | - Philippe Herman
- AP-HP, Hôpital Lariboisière, Department of Otorhinolaryngology and Paris Diderot University, Paris, France
| | - Benjamin Verillaud
- AP-HP, Hôpital Lariboisière, Department of Otorhinolaryngology and Paris Diderot University, Paris, France
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Long term outcome of skull-base chondrosarcoma patients treated with high-dose proton therapy with or without conventional radiation therapy. Radiother Oncol 2018; 129:520-526. [DOI: 10.1016/j.radonc.2018.06.040] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 06/29/2018] [Accepted: 06/29/2018] [Indexed: 12/30/2022]
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18
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Asfar MM, Hutcheson KA, Won AM. Prosthetic Rehabilitation with Palatal Lift/Augmentation in a Patient with Neurologic/Motor Deficit Due To Cancer Therapy for Chondrosarcoma. J Prosthodont 2018; 28:234-238. [PMID: 30357985 DOI: 10.1111/jopr.12990] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/11/2018] [Indexed: 11/29/2022] Open
Abstract
This clinical report describes the prosthetic rehabilitation of a 25-year-old man with a history of grade II chondrosarcoma at the skull base who had undergone surgical resection and thereafter developed velopharyngeal incompetency (VPI), dysarthria, and dysphagia. Upon baseline fiberoptic endoscopic evaluation of swallowing (FEES), the patient had an atypical pattern of VPI with minimal to no velar lift during speech, blow, or suck tasks, but near complete velar lift and seal during swallowing. A palatal augmentation prosthesis combined with a resilient palatal lift extension was fabricated to enhance speech by displacing the soft palate and to decrease hypernasality, while avoiding interference with bolus transport. A resilient wrought wire extension was necessary to accommodate the velar movement upon swallowing while keeping the integrity of the velar lift during speech. In conclusion, this unique combination prosthesis was able to help the patient's atypical pattern of VPI by improving speech and preserving swallowing function, which was confirmed during a post-endoscopic evaluation.
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Affiliation(s)
- Midhat M Asfar
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Katherine A Hutcheson
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Alexander M Won
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX
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Isaacson B. Anatomy and Surgical Approach of the Ear and Temporal Bone. Head Neck Pathol 2018; 12:321-327. [PMID: 30069845 PMCID: PMC6081290 DOI: 10.1007/s12105-018-0926-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 04/27/2018] [Indexed: 12/01/2022]
Abstract
The temporal bone is one of the more complex structures at the skull base that houses the hearing and vestibular organs, numerous nerves, and vessels. A host of inflammatory and neoplastic processes can occur within the temporal bone that often necessitate permanent and frozen section pathologic examination. A number of simple to complex surgical procedures are used to manage temporal bone pathology. This chapter will provide a brief overview of normal temporal bone anatomy, common surgical approaches, normal histology, and indications for pathologic examination.
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Affiliation(s)
- Brandon Isaacson
- Department of Otolaryngology – HNS, UT – Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9035 USA
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Proposed Treatment Paradigm for Intracranial Chondrosarcomas Based on Multidisciplinary Coordination. World Neurosurg 2017; 109:e517-e530. [PMID: 29033377 DOI: 10.1016/j.wneu.2017.10.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 10/02/2017] [Accepted: 10/04/2017] [Indexed: 12/19/2022]
Abstract
OBJECTIVES There was no consensus regarding the treatment of intracranial chondrosarcoma (CSA). The study aimed to evaluate the adverse factors for progression-free survival (PFS) and overall survival (OS) and to propose a treatment strategy for CSA. METHODS The clinical chart and radiographic data of 106 consecutive cases (mesenchymal and conventional CSA in 18 and 88 patients, respectively) of surgically treated CSAs were retrospectively reviewed. RESULTS Gross total resection was achieved in 43 patients (40.6%), and adjuvant radiotherapy was administered in 45 patients. After a mean follow-up duration of 47.8 months, 38 patients (37.3%) experienced recurrence. PFS and disease-specific OS at 5 years was 57.7% and 74.4%. Independent adverse factors for PFS were previous surgery (hazard ratio [HR] 2.261; P = 0.028), increased lesion size (HR, 1.298; P = 0.026), extent of surgical resection (HR, 3.226; P < 0.001), malignant pathology (HR, 2.018; P = 0.003), and postoperative radiotherapy (HR, 3.246; P = 0.001). The stereotactic radiosurgery subgroup presented best 5-year PFS of 88.9%, and a linear accelerator prolonged the mean PFS time (57.0 months) compared with no radiation (38.1 months). In the incomplete resection subgroup (n = 63), radiotherapy significantly benefited tumor control (HR, 2.101; P = 0.016). Extent of surgical resection (HR, 1.797; P = 0.026) and malignant disease (HR, 1.717; P = 0.030) were associated with OS. CONCLUSIONS Intracranial CSAs were not completely amendable by surgery alone. Gross total resection as far as possible plus radiation were necessary for mesenchymal CSA and conventional CSA with active growth or residual tumor. Stereotactic radiosurgery was an alternative if proton therapy was unavailable. A future study with a large cohort is required to verify our findings.
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