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Blanch Pujol G, Sanmillan JL, Sánchez-Fernandez JJ, Fernandez-Conejero I, Cifre Serra P, Torres A, Gabarrós Canals A. Anticipating Facial Nerve Position Using Three-Dimensional Tractography During the Preoperative Assessment of Cerebellopontine Angle Tumors. World Neurosurg 2022; 168:e317-e327. [DOI: 10.1016/j.wneu.2022.09.119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 09/26/2022] [Accepted: 09/27/2022] [Indexed: 12/15/2022]
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Gürün E, Akdulum İ, Kılıç P, Tokgöz N, Uçar M. Evaluation of schwannoma using the 3D-SPACE sequence: comparison with the 3D-CISS sequence in 3T-MRI. Turk J Med Sci 2021; 51:1123-1135. [PMID: 33387986 PMCID: PMC8283456 DOI: 10.3906/sag-2010-30] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Accepted: 01/01/2021] [Indexed: 12/03/2022] Open
Abstract
Background/aim The purpose of this study is to compare the diagnostic accuracy and interobserver reliability of the T2-weighted 3D-SPACE (three-dimensional sampling perfection with application-optimized contrasts by using different flip angle evolutions) sequence in comparison with T2-weighted 3D-CISS (three-dimensional constructive interference in steady state) sequences for diagnosis of schwannomas. Materials and methods Forty patients with cerebellopontine angle (CPA), internal acoustic canal (IAC), and cochlear schwannoma who had undergone magnetic resonance imaging (MRI) using the 3D-CISS and 3D-SPACE sequences were identified. The sequences were retrospectively evaluated by two radiologists for the qualitative analyses, which were subsequently compared using the Mann–Whitney U test. Following this, kappa values were used for interobserver agreement. P < 0.05 was considered to be of statistical significance. Results The interobserver agreement was found to be excellent between the two observers for the interpretation of all qualitative analyses for both sequences (kappa value > 0.8). The 3D-SPACE sequences demonstrated significantly better qualitative scores and fewer artifacts compared with the 3D-CISS sequences (p < 0.05). Conclusion Our results demonstrate that 3D-SPACE is superior to 3D-CISS in the imaging process of the schwannoma in terms of image quality, description of the relationship between the lesion and cranial nerve, signal differentiation between lesion and cistern, and signal differentiation between the lesion and adjacent brain.
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Affiliation(s)
- Enes Gürün
- Department of Radiology, İskilip Atıf Hoca State Hospital, Çorum, Turkey
| | - İsmail Akdulum
- Department of Radiology, Gazi University Hospital, Ankara, Turkey
| | - Pınar Kılıç
- Department of Radiology, Pursaklar State Hospital, Ankara, Turkey
| | - Nil Tokgöz
- Department of Radiology, Gazi University Hospital, Ankara, Turkey
| | - Murat Uçar
- Department of Radiology, Gazi University Hospital, Ankara, Turkey
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Guo X, Zhu Y, Wang X, Xu K, Hong Y. Peritumoral Edema Is Associated With Postoperative Hemorrhage and Reoperation Following Vestibular Schwannoma Surgery. Front Oncol 2021; 11:633350. [PMID: 33767998 PMCID: PMC7985450 DOI: 10.3389/fonc.2021.633350] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 02/15/2021] [Indexed: 11/23/2022] Open
Abstract
Background: Postoperative hemorrhage (POH) is a severe complication following vestibular schwannoma surgery that may require surgical treatment. The purpose of our study is to identify risk factors associated with POH and reoperation following the resection of vestibular schwannoma. Methods: We retrospectively recruited 452 vestibular schwannoma patients treated with retrosigmoid approach. The primary outcome was POH, and the secondary outcome was reoperation for POH. Clinical and radiographic data were compared by performing univariate analysis and logistic regression analysis. Results: Among the 452 patients, 37 patients (8.2%) presented with POH and14 patients (3.1%) required reoperation within a 30-day hospitalization period. The univariate analysis showed that peritumoral edema, tumor diameter >30 mm, severe postoperative hypertension, and length of hospital stay were associated with POH and reoperation for POH. Logistic regression analysis showed that peritumoral edema [odds ratio (OR) 4.042, 95% confident interval (CI) 1.830–8.926, P = 0.001] and tumor diameter >30 mm (OR 3.192, 95% CI 1.421–7.168, P = 0.005) were independent predictive factors for POH. Peritumoral edema (OR 7.071, 95% CI 2.342–21.356, P = 0.001) was an independent predictive factor for reoperation by using logistic regression analysis. Further analysis revealed that larger tumor and incomplete tumor resection were both associated with a higher incidence of peritumoral edema. Conclusion: Peritumoral edema and tumor size are independent risk factors for POH following vestibular schwannoma surgery. And larger hematoma occurs more commonly in tumors with peritumoral edema which may require reoperation. Tumor size and extent of tumor resection are associated with peritumoral edema. Close attention should be paid to high-risk patients especially for those who presented with severe postoperative hypertension.
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Affiliation(s)
- Xiaoming Guo
- Department of Neurosurgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Neurosurgery, Tongde Hospital of Zhejiang Province, Hangzhou, China
| | - Yueli Zhu
- Department of Geriatrics, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiaoyu Wang
- Department of Neurosurgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Ke Xu
- Department of Neurosurgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Yuan Hong
- Department of Neurosurgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
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Starnoni D, Giammattei L, Cossu G, Link MJ, Roche PH, Chacko AG, Ohata K, Samii M, Suri A, Bruneau M, Cornelius JF, Cavallo L, Meling TR, Froelich S, Tatagiba M, Sufianov A, Paraskevopoulos D, Zazpe I, Berhouma M, Jouanneau E, Verheul JB, Tuleasca C, George M, Levivier M, Messerer M, Daniel RT. Surgical management for large vestibular schwannomas: a systematic review, meta-analysis, and consensus statement on behalf of the EANS skull base section. Acta Neurochir (Wien) 2020; 162:2595-2617. [PMID: 32728903 PMCID: PMC7550309 DOI: 10.1007/s00701-020-04491-7] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 07/10/2020] [Indexed: 12/24/2022]
Abstract
BACKGROUND AND OBJECTIVE The optimal management of large vestibular schwannomas continues to be debated. We constituted a task force comprising the members of the EANS skull base committee along with international experts to derive recommendations for the management of this problem from a European perspective. MATERIAL AND METHODS A systematic review of MEDLINE database, in compliance with the PRISMA guidelines, was performed. A subgroup analysis screening all surgical series published within the last 20 years (January 2000 to March 2020) was performed. Weighted summary rates for tumor resection, oncological control, and facial nerve preservation were determined using meta-analysis models. This data along with contemporary practice patterns were discussed within the task force to generate consensual recommendations regarding preoperative evaluations, optimal surgical strategy, and follow-up management. RESULTS Tumor classification grades should be systematically used in the perioperative management of patients, with large vestibular schwannomas (VS) defined as > 30 mm in the largest extrameatal diameter. Grading scales for pre- and postoperative hearing (AAO-HNS or GR) and facial nerve function (HB) are to be used for reporting functional outcome. There is a lack of consensus to support the superiority of any surgical strategy with respect to extent of resection and use of adjuvant radiosurgery. Intraoperative neuromonitoring needs to be routinely used to preserve neural function. Recommendations for postoperative clinico-radiological evaluations have been elucidated based on the surgical strategy employed. CONCLUSION The main goal of management of large vestibular schwannomas should focus on maintaining/improving quality of life (QoL), making every attempt at facial/cochlear nerve functional preservation while ensuring optimal oncological control, thereby allowing to meet patient expectations. Despite the fact that this analysis yielded only a few Class B evidences and mostly expert opinions, it will guide practitioners to manage these patients and form the basis for future clinical trials.
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Affiliation(s)
- Daniele Starnoni
- Department of Neurosurgery Service and Gamma Knife Center, University hospital of Lausanne and Faculty of Biology and Medicine, University of Lausanne, Rue du Bugnon 46, CH-1011, Lausanne, Switzerland
| | | | - Giulia Cossu
- Department of Neurosurgery Service and Gamma Knife Center, University hospital of Lausanne and Faculty of Biology and Medicine, University of Lausanne, Rue du Bugnon 46, CH-1011, Lausanne, Switzerland
| | - Michael J Link
- Department of Neurosurgery, Mayo Clinic, Rochester, MN, USA
| | - Pierre-Hugues Roche
- Department of Neurosurgery, CHU North Hospital, Aix-Marseille University, Marseille, France
| | - Ari G Chacko
- Department of Neurological Sciences, Christian Medical College, Vellore, Tamil Nadu, India
| | - Kenji Ohata
- Department of Neurosurgery, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Majid Samii
- Neurosurgery, International Neuroscience Institute, Hannover, Germany
| | - Ashish Suri
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India
| | - Michael Bruneau
- Department of Neurosurgery, Erasme Hospital, Brussels, Belgium
| | - Jan F Cornelius
- Department of Neurosurgery, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Luigi Cavallo
- Department of Neurosurgery, University Hospital of Naples Federico II, Naples, NA, Italy
| | - Torstein R Meling
- Department of Neurosurgery, University Hospital of Geneva, Geneva, Switzerland
| | | | - Marcos Tatagiba
- Department of Neurosurgery, Eberhard Karls University of Tübingen, Tübingen, Germany
| | - Albert Sufianov
- Federal Centre of Neurosurgery, Tyumen, Russian Federation; Department of Neurosurgery, The State Education Institution of Higher Professional Training, The First Sechenov Moscow State Medical University under Ministry of Health, Tyumen, Russian Federation
| | - Dimitrios Paraskevopoulos
- Department of Neurosurgery, Barts Health NHS Trust, St. Bartholomew's and The Royal London Hospital, London, UK
| | - Idoya Zazpe
- Servicio de Neurocirugía, Complejo Hospitalario de Navarra, Pamplona, Spain
- Servicio de Cirugía Torácica, Complejo Hospitalario de Navarra, Pamplona, Spain
| | - Moncef Berhouma
- Department of Neurosurgery, Hopital Neurologique Pierre Wertheimer, Lyon, France
| | - Emmanuel Jouanneau
- Department of Neurosurgery, Hopital Neurologique Pierre Wertheimer, Lyon, France
| | - Jeroen B Verheul
- Department of Neurosurgery and Gamma knife Centre, Elisabeth-Tweesteden Hospital, Tilburg, The Netherlands
| | - Constantin Tuleasca
- Department of Neurosurgery Service and Gamma Knife Center, University hospital of Lausanne and Faculty of Biology and Medicine, University of Lausanne, Rue du Bugnon 46, CH-1011, Lausanne, Switzerland
- Signal Processing Laboratory (LTS 5) Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne, Lausanne, Switzerland
| | - Mercy George
- ENT Service, Centre Hospitalier Universitaire Vaudois (CHUV); Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Marc Levivier
- Department of Neurosurgery Service and Gamma Knife Center, University hospital of Lausanne and Faculty of Biology and Medicine, University of Lausanne, Rue du Bugnon 46, CH-1011, Lausanne, Switzerland
| | - Mahmoud Messerer
- Department of Neurosurgery Service and Gamma Knife Center, University hospital of Lausanne and Faculty of Biology and Medicine, University of Lausanne, Rue du Bugnon 46, CH-1011, Lausanne, Switzerland
| | - Roy Thomas Daniel
- Department of Neurosurgery Service and Gamma Knife Center, University hospital of Lausanne and Faculty of Biology and Medicine, University of Lausanne, Rue du Bugnon 46, CH-1011, Lausanne, Switzerland.
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Inner ear MRI: Is it always useful to manage intravenous contrast? RADIOLOGIA 2020. [DOI: 10.1016/j.rxeng.2020.03.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Khaled M, Moghazy K, Elsaadany W, Eissa L. Additional diagnostic role of MRI spectroscopy, diffusion and susceptibility imaging in differentiation of CPA masses: our experience with emphasis on schwannomas and meningiomas. THE EGYPTIAN JOURNAL OF RADIOLOGY AND NUCLEAR MEDICINE 2020. [DOI: 10.1186/s43055-020-00256-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
CPA masses are uncommon lesions and usually have quite distinctive imaging features. Still, diagnosis can be challenging in some cases, carrying a significant impact on the choice of treatment and surgical approach. The purpose of this study was to validate the usefulness of MRI spectroscopy, diffusion, and susceptibility in the characterization of CPA masses with the emphasis on the two commonest lesions: schwannomas and meningiomas.
Results
The study included a total of 27 cases: schwannomas (n = 12), meningiomas (n = 7), epidermoid cysts (n = 2), two chondrosarcomas (n = 2), arachnoid cyst (n = 1), glomus tumor (n = 1), a meningeal metastasis (n = 1), and an endolymphatic sac tumor (n = 1). DWI revealed: eight lesions showed low ADC (<1 × 10−3 mm2/s), 15 lesions with intermediate ADC values (1–1.8 × 10−3 mm2/s), and 4 lesions had high ADC (>1.8 × 10−3 mm2/s.) Meningiomas showed low to intermediate ADC values while schwannomas showed intermediate to high ADC values. A cut-off ADC value of (1 × 10−3 mm2/s) is statistically significant in the differentiation of meningioma from schwannoma. A myoinositol peak was in all 12 schwannomas and single meningioma while 6 meningiomas displayed alanine peak, with a very good statistical significance. Remaining lesions revealed non-specific spectra. SWI made in 18 lesions revealed signal voids in three schwannomas and glomus.
Conclusions
Though MRI features of CPA masses are distinctive in most clinical settings; MRI spectroscopy, diffusion, and susceptibility can provide highly informative additional data in problematic cases. An intermediate to high ADC value plus myoinositol peak and signal voids of micro-bleeds are highly suggestive of schwannomas. This is in contrary to meningiomas displaying low to intermediate ADC and an alanine peak with no micro-bleeds. The less common lesions revealed non-specific data.
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Sepúlveda Villegas CA, Santos Armentia E, Utrera Pérez E, Jurado Basildo C, Novoa Ferro M, Del Campo Estepar S. Inner ear MRI: is it always useful to manage intravenous contrast? RADIOLOGIA 2020; 62:376-383. [PMID: 32089257 DOI: 10.1016/j.rx.2020.01.002] [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: 08/28/2019] [Revised: 12/30/2019] [Accepted: 01/15/2020] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To evaluate the added value of administering intravenous contrast (IVC) routinely to the MRI of patients with audiovestibular symptoms in the assessment of a neuroradiologist and a resident. MATERIALS AND METHODS Retrospective study including patients who had an inner ear MRI for two months. Two radiologists reviewed independently and blinded the images. A first assessment was made analyzing just the sequences acquired without contrast and then a second evaluation of all the sequences, including post-contrast T1 sequences. The interobserver correlation and the correlation between MRI findings and the reason for requesting the study were calculated. RESULTS 40 patients were included. The range age was 36-80 years. The most frequent reason for request the MRI was hearing loss (52.5%). Neuroradiologist without IVC found 82.5% of extraotic pathology and 17.5% of otic pathology, highlighting the neurinoma of the VIII pair (7.5%); ossifying labyrinthitis, retrofenestrated otosclerosis and cholesteatoma. After IVC administration, findings were similar. The resident identified otic pathology in 5% in baseline sequences and 20% using CIV. The interobserver correlation using IVC was excellent (0.97), but weak without IVC (0.52). There was a correlation between the reasons for request the MRI and the findings in the ears, both in protocols without IVC (p = 0.004) and in protocols with IVC (p = 0.002). CONCLUSION Inner ear MRI without contrast gives relevant information to assess audiovestibular symptoms. The use of IVC increases the degree of confidence in a novel radiologist, while in the expert its use is less relevant. A protocol should be proposed in which gadolinium is used in selected patients.
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Affiliation(s)
| | - E Santos Armentia
- Departamento de Radiología, Hospital Povisa, Vigo, Pontevedra, España
| | - E Utrera Pérez
- Departamento de Radiología, Hospital Povisa, Vigo, Pontevedra, España
| | - C Jurado Basildo
- Departamento de Radiología, Hospital Povisa, Vigo, Pontevedra, España
| | - M Novoa Ferro
- Departamento de Radiología, Hospital Povisa, Vigo, Pontevedra, España
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8
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Giordano M, Gerganov V, Metwali H, Gallieni M, Samii M, Samii A. Imaging features and classification of peritumoral edema in vestibular schwannoma. Neuroradiol J 2019; 33:169-173. [PMID: 31840570 DOI: 10.1177/1971400919896253] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Peritumoral edema (PTE) is rarely present in patients with vestibular schwannomas (VS). We studied the correlation between radiological tumor characteristics and the presence of edema, describe its magnetic resonance imaging features and classify the different edema patterns. METHODS We analysed 605 consecutive patients treated for VS at our Institute. PTE was found in 30 patients, studied on fluid attenuated inversion recovery sequences and categorised as involving the brachium pontis, cerebellum and/or brainstem. Tumor volume, shape, surface, internal structure and axis of growth were evaluated and compared to a matched series of 30 patients without PTE. RESULTS In our population of patients, 5% showed PTE. Edema involved the brachium pontis in 22 cases (88%), cerebellum in 15 (60%) and brainstem in 3 (12%). PTE was classified as mild (one region involved), moderate (two regions) and severe (three regions). Edema was present not only perpendicular to the major tumor growth axis but also parallel to it (91%). The difference between the two groups in regards to tumor shape and surface was not significant. We found no correlation between tumor and edema volumes. CONCLUSIONS VS can cause PTE, but its incidence is less frequent than in skull base meningiomas. PTE involves most frequently the brachium pontis, followed by the cerebellum and brainstem. Its occurrence correlates with tumor size but not with other radiological VS features. PTE is not always located perpendicular to the major axis of tumor growth, which indicated that the compressive theory proposed for meningiomas is not plausible explanation for its manifestation.
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Affiliation(s)
- Mario Giordano
- Department of Neurosurgery, International Neuroscience Institute, Germany
| | - Venelin Gerganov
- Department of Neurosurgery, International Neuroscience Institute, Germany
| | - Hussam Metwali
- Department of Neurosurgery, International Neuroscience Institute, Germany
| | - Massimo Gallieni
- Department of Neurosurgery, International Neuroscience Institute, Germany
| | - Madjid Samii
- Department of Neurosurgery, International Neuroscience Institute, Germany
| | - Amir Samii
- Department of Neurosurgery, International Neuroscience Institute, Germany
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Crowson MG, Rocke DJ, Hoang JK, Weissman JL, Kaylie DM. Cost-effectiveness analysis of a non-contrast screening MRI protocol for vestibular schwannoma in patients with asymmetric sensorineural hearing loss. Neuroradiology 2017. [PMID: 28623482 DOI: 10.1007/s00234-017-1859-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PURPOSE We aimed to determine if a non-contrast screening MRI is cost-effective compared to a full MRI protocol with contrast for the evaluation of vestibular schwannomas. METHODS A decision tree was constructed to evaluate full MRI and screening MRI strategies for patients with asymmetric sensorineural hearing loss. If a patient were to have a positive screening MRI, s/he received a full MRI. Vestibular schwannoma prevalence, MRI specificity and sensitivity, and gadolinium anaphylaxis incidence were obtained through literature review. Institutional charge data were obtained using representative patient cohorts. One-way and probabilistic sensitivity analyses were completed to determine CE model threshold points for MRI performance characteristics and charges. RESULTS The mean charge for a full MRI with contrast was significantly higher than a screening MRI ($4089 ± 1086 versus $2872 ± 741; p < 0.05). The screening MRI protocol was more cost-effective than a full MRI protocol with a willingness-to-pay from $0 to 20,000 USD. Sensitivity analyses determined that the screening protocol dominated when the screening MRI charge was less than $4678, and the imaging specificity exceeded 78.2%. The screening MRI protocol also dominated when vestibular schwannoma prevalence was varied between 0 and 1000 in 10,000 people. CONCLUSION A screening MRI protocol is more cost-effective than a full MRI with contrast in the diagnostic evaluation of a vestibular schwannoma. A screening MRI likely also confers benefits of shorter exam time and no contrast use. Further investigation is needed to confirm the relative performance of screening protocols for vestibular schwannomas.
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Affiliation(s)
- Matthew G Crowson
- Division of Otolaryngology-Head & Neck Surgery, Duke University Medical Center, 2301 Erwin Road, Durham, NC, 27710, USA.
| | - Daniel J Rocke
- Division of Otolaryngology-Head & Neck Surgery, Duke University Medical Center, 2301 Erwin Road, Durham, NC, 27710, USA
| | - Jenny K Hoang
- Department of Radiology, Duke University Medical Center, Durham, NC, USA
| | - Jane L Weissman
- Professor Emerita of Diagnostic Radiology, Oregon Health Sciences University, Portland, OR, USA
| | - David M Kaylie
- Division of Otolaryngology-Head & Neck Surgery, Duke University Medical Center, 2301 Erwin Road, Durham, NC, 27710, USA
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Kulkarni BSN, Bajwa H, Chandrashekhar M, Sharma SD, Singareddy R, Gudipudi D, Ahmad S, Kumar A, Sresty NM, Raju AK. CT- and MRI-based gross target volume comparison in vestibular schwannomas. Rep Pract Oncol Radiother 2017; 22:201-208. [PMID: 28461783 PMCID: PMC5403802 DOI: 10.1016/j.rpor.2017.02.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 12/31/2016] [Accepted: 02/06/2017] [Indexed: 11/27/2022] Open
Abstract
AIM This study represents an enumeration and comparison of gross target volumes (GTV) as delineated independently on contrast-enhanced computed tomography (CT) and T1 and T2 weighted magnetic resonance imaging (MRI) in vestibular schwannomas (VS). BACKGROUND Multiple imaging in radiotherapy improves target localization. METHODS AND MATERIALS 42 patients of VS were considered for this prospective study with one patient showing bilateral tumor. The GTV was delineated separately on CT and MRI. Difference in volumes were estimated individually for all the 43 lesions and similarity was studied between CT and T1 and T2 weighted MRI. RESULTS The male to female ratio for VS was found to be 1:1.3. The tumor was right sided in 34.9% and left sided in 65.1%. Tumor volumes (TV) on CT image sets were ranging from 0.251 cc to 27.27 cc. The TV for CT, MRI T1 and T2 weighted were 5.15 ± 5.2 cc, 5.8 ± 6.23 cc, and 5.9 ± 6.13 cc, respectively. Compared to MRI, CT underestimated the volumes. The mean dice coefficient between CT versus T1 and CT versus T2 was estimated to be 68.85 ± 18.3 and 66.68 ± 20.3, respectively. The percentage of volume difference between CT and MRI (%VD: mean ± SD for T1; 28.84 ± 15.0, T2; 35.74 ± 16.3) and volume error (%VE: T1; 18.77 ± 10.1, T2; 23.17 ± 13.93) were found to be significant, taking the CT volumes as the baseline. CONCLUSIONS MRI with multiple sequences should be incorporated for tumor volume delineation and they provide a clear boundary between the tumor and normal tissue with critical structures nearby.
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Affiliation(s)
| | - Harjot Bajwa
- Basavatarakam Indo American Cancer Hospital and Research Center, Hyderabad 500035, Telangana, India
| | - Mukka Chandrashekhar
- Jawaharlal Nehru Technological University Hyderabad, Kukatpally, Hyderabad 500 085, Telangana, India
| | - Sunil Dutt Sharma
- Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, CTCRS, Anushaktinagar, Mumbai 400094, India
| | - Rohith Singareddy
- Basavatarakam Indo American Cancer Hospital and Research Center, Hyderabad 500035, Telangana, India
| | - Dileep Gudipudi
- Basavatarakam Indo American Cancer Hospital and Research Center, Hyderabad 500035, Telangana, India
| | - Shabbir Ahmad
- Basavatarakam Indo American Cancer Hospital and Research Center, Hyderabad 500035, Telangana, India
| | - Alok Kumar
- Clearmedi Healthcare Pvt. Ltd., Kolkata Area, India
| | - N.V.N. Madusudan Sresty
- Basavatarakam Indo American Cancer Hospital and Research Center, Hyderabad 500035, Telangana, India
| | - Alluri Krishnam Raju
- Basavatarakam Indo American Cancer Hospital and Research Center, Hyderabad 500035, Telangana, India
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Patel NS, Van Abel KM, Link MJ, Driscoll CLW, Van Gompel JJ, Neff BA, Lane JI, Carlson ML. Prevalence and Surgical Implications of Dural Enhancement at the Porus Acusticus in Vestibular Schwannomas. Otolaryngol Head Neck Surg 2016; 155:1021-1027. [PMID: 27703093 DOI: 10.1177/0194599816670144] [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] [Received: 07/06/2016] [Revised: 08/12/2016] [Accepted: 08/30/2016] [Indexed: 11/17/2022]
Abstract
OBJECTIVE Demonstrate the association of radiographic dural enhancement with increased tumor adherence at the porus acusticus, which may influence completeness of resection and facial nerve outcome. STUDY DESIGN Case series with chart review. SETTING Academic referral center. SUBJECTS AND METHODS A total of 205 consecutive patients with histopathologically confirmed vestibular schwannoma (VS) were evaluated. Patients with tumors exhibiting dural enhancement on postgadolinium T1-weighted magnetic resonance imaging were identified and compared with matched controls. Completeness of resection, intraoperative details, and facial nerve outcomes were analyzed. RESULTS Excluding strictly intracanalicular tumors (n = 32, 16%) and those with NF2 (n = 10, 4.9%), the presence of dural enhancement was radiographically confirmed in 16 (9.8%) cases. Paired analysis did not reveal significant baseline differences between cases and controls. Subtotal resection was performed in 5 (31%) of the 16 patients with tumors exhibiting dural enhancement, in contrast to 1 (3%) of the matched controls (P = .01). Four (25%) demonstrated increased tumor adherence at the porus acusticus intraoperatively, compared with 1 control (3%, P = .04). Long-term facial nerve function was similar between cases and controls (81% vs 84% House-Brackmann I-II function, P = 1.00). CONCLUSION Dural enhancement is present in approximately 10% of extracanalicular VS. Dural enhancement at the porus acusticus may represent hypervascularity, dural reaction, or infiltration, and portends increased tumor adherence and greater likelihood of subtotal resection to preserve facial nerve function. To our knowledge, this is the first series that reports the prevalence of this phenomenon in VS and the potential surgical implications. Recognition preoperatively may be valuable toward patient counseling.
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Affiliation(s)
- Neil S Patel
- Department of Otorhinolaryngology, Mayo Clinic, Rochester, Minnesota, USA
| | - Kathryn M Van Abel
- Department of Otorhinolaryngology, Mayo Clinic, Rochester, Minnesota, USA
| | - Michael J Link
- Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Colin L W Driscoll
- Department of Otorhinolaryngology, Mayo Clinic, Rochester, Minnesota, USA
| | - Jamie J Van Gompel
- Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Brian A Neff
- Department of Otorhinolaryngology, Mayo Clinic, Rochester, Minnesota, USA
| | - John I Lane
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA
| | - Matthew L Carlson
- Department of Otorhinolaryngology, Mayo Clinic, Rochester, Minnesota, USA
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Samii M, Giordano M, Metwali H, Almarzooq O, Samii A, Gerganov VM. Prognostic Significance of Peritumoral Edema in Patients With Vestibular Schwannomas. Neurosurgery 2016; 77:81-5; discussion 85-6. [PMID: 25856107 DOI: 10.1227/neu.0000000000000748] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Peritumoral edema (PTE) in skull base meningiomas correlates to the absence of an arachnoid plane and difference in outcome. In vestibular schwannomas (VS), PTE and its significance for microsurgery and outcome have never been systematically evaluated. OBJECTIVE To evaluate whether PTE correlates with tumor characteristics, the presence of an arachnoid plane, and outcome. METHODS A retrospective study of the institutional database. PTE was evaluated on fluid-attenuated inversion recovery magnetic resonance images. Preoperative patient data and intraoperative tumor features (presence of tumor pseudocapsule, vascularity, degree of adhesion/invasion of the arachnoid) were noted. Outcome measures were completeness of removal, neurological outcome, and complication rate. These parameters in patients with PTE (group A) were correlated to those in matched series without edema (group B). RESULTS Thirty patients presented with PTE (5%). The mean VS size was 3.4 cm. No major differences in the degree of adhesion or presence of an arachnoid plane were found. VS with PTE were more frequently hypervascular (26.7% in group A vs 6.7% in group B). The presence of PTE in VS was not related to surgical radicality. VS with PTE had worse early postoperative facial nerve function, but at 12 months, there was no major difference. VS with PTE were prone to cause postoperative hemorrhages in the tumor bed. CONCLUSION PTE in VS does not correlate with the degree of tumor adhesion and the presence of an arachnoid dissection plane. The radicality of tumor removal and long-term functional outcome in patients with and without PTE was similar. VS with PTE are more vascular and prone to cause postoperative hemorrhages. Therefore, meticulous hemostasis is advisable.
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Affiliation(s)
- Madjid Samii
- Department of Neurosurgery, International Neuroscience Institute, Hannover, Germany
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Singh K, Singh MP, Thukral C, Rao K, Singh K, Singh A. Role of magnetic resonance imaging in evaluation of cerebellopontine angle schwannomas. Indian J Otolaryngol Head Neck Surg 2014; 67:21-7. [PMID: 25621227 DOI: 10.1007/s12070-014-0736-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 05/28/2014] [Indexed: 12/01/2022] Open
Abstract
The aim of the present study was to evaluate the role of Magnetic Resonance Imaging (MRI) to localize and characterize the MR imaging features of cerebellopontine angle schwannomas and to compare with surgical/histopathological findings. It was a prospective study which included 19 patients, who presented with signs and symptoms s/o any lesion in the CP angle and were referred to the radiology department for MRI. All patients included in the study were subjected to detailed clinical history and physical examination following which MRI was carried out on Philips Gyroscan Achieva 1.5 Tesla unit and the standard protocol consisted of T1WI, T2WI, DWI and FLAIR images in axial, sagittal and coronal planes. Hearing abnormality was the most common presenting complaint in patients with CP angle schwannoma's followed by headache and tinnitus. Vestibulocochlear nerve was the most commonly involved nerve in patients with these lesions followed by involvement of trigeminal nerve. MRI was erroneous in giving provisional diagnosis of schwannoma in one case, which on subsequent surgery and histopathology was found to be a meningioma. The sensitivity of MRI for correctly diagnosing vestibular schwannoma was 100 % and specificity was 92.86 % with a positive predictive value of 94.12 % and accuracy of 96.67 %. MRI is considered as an excellent noninvasive investigation for CP angle schwannoma's. It can identify the site and extension of the lesions as well as the characteristic signal. Apart from diagnosing, MR imaging plays an important role in stratifying patients into appropriate treatment options.
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