1
|
Rajeswarie RT, Mallik D, Rudrappa S, Gopal S. Cases of Mixed Schwannoma-Meningioma With and Without Neurofibromatosis 2 with Emphasis on Tumorigenesis. Int J Surg Pathol 2024; 32:511-514. [PMID: 37487199 DOI: 10.1177/10668969231188897] [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] [Indexed: 07/26/2023]
Abstract
Concurrent occurrence of schwannoma and meningiomas are rare, and are found especially in association with neurofibromatosis type 2 (NF2). Occurrence of mixed tumor without the aforementioned conditions is extremely rare. We present three cases of mixed tumor in different locations, including two with NF2 and one without NF2. We analyse the relationship of mixed tumor with NF2 and its clinical implications. Presence of mixed schwannoma-meningioma should prompt screening for NF2. Thus aids in early diagnosis of unsuspected NF2 cases. We observed that irrespective of different locations, cases with NF2 showed frequent recurrence of schwannoma as compared to case who did not fit in the existing clinical criteria for NF2. Collision tumor and thereby NF2 mutations indicates the prognosis and recurrence of the tumor, thereby guides in deciding the management.
Collapse
Affiliation(s)
| | - Dattatraya Mallik
- Departments of Laboratory Medicine and Neurosurgery, Sakra World Hospital, Bangalore, India
| | - Satish Rudrappa
- Departments of Laboratory Medicine and Neurosurgery, Sakra World Hospital, Bangalore, India
| | - Swaroop Gopal
- Departments of Laboratory Medicine and Neurosurgery, Sakra World Hospital, Bangalore, India
| |
Collapse
|
2
|
Palmisciano P, Ferini G, Watanabe G, Conching A, Ogasawara C, Scalia G, Bin-Alamer O, Haider AS, Passanisi M, Maugeri R, Hoz SS, Baldoncini M, Campero A, Salvati M, Cohen-Gadol AA, Umana GE. Surgical Management of Craniovertebral Junction Schwannomas: A Systematic Review. Curr Oncol 2022; 29:4842-4855. [PMID: 35877244 PMCID: PMC9319499 DOI: 10.3390/curroncol29070384] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/05/2022] [Accepted: 07/07/2022] [Indexed: 11/16/2022] Open
Abstract
Background: Craniovertebral junction (CVJ) schwannomas are rare, with surgery and stereotactic radiosurgery (SRS) being effective yet challenging options. We systematically reviewed the literature on CVJ schwannomas. Methods: PubMed, Scopus, Web-of-Science, and Cochrane were searched following the PRISMA statement to include studies reporting CVJ schwannomas. Clinical features, management, and outcomes were analyzed. Results: We collected 353 patients from 101 included articles. Presenting symptoms were mostly neck pain (30.3%) and headache (26.3%), with most cranial neuropathies involving the XII (31.2%) and X (24.4%) nerves. Most tumors originated from C2 (30.9%) and XII (29.4%) nerves, being extracranial (45.1%) and intradural-extradural (44.2%). Erosion of C1–C2 vertebrae (37.1%), the hypoglossal canal (28.3%), and/or jugular foramen (20.1%) were noted. All tumors were operated, preferably with the retrosigmoid approach (36.5%), with the far-lateral approach (29.7%) or with the posterior approach and cervical laminectomy (26.9%), far-lateral approaches (14.2%), or suboccipital craniotomy with concurrent cervical laminectomy (14.2%). Complete tumor resection was obtained most frequently (61.5%). Adjuvant post-surgery stereotactic radiosurgery was delivered in 5.9% patients. Median follow-up was 27 months (range, 12–252). Symptom improvement was noted in 88.1% of cases, and cranial neuropathies showed improvement in 10.2%. Post-surgical complications occurred in 83 patients (23.5%), mostly dysphagia (7.4%), new cranial neuropathies (6.2%), and cerebrospinal fluid leak (5.9%). A total of 16 patients (4.5%) had tumor recurrence and 7 died (2%), with median overall survival of 2.7 months (range, 0.1–252). Conclusions: Microsurgical resection is safe and effective for CVJ schwannomas. Data on SRS efficacy and indications are still lacking, and its role deserves further evaluation.
Collapse
Affiliation(s)
- Paolo Palmisciano
- Department of Neurosurgery, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA;
| | - Gianluca Ferini
- Department of Radiation Oncology, REM Radioterapia srl, 95029 Viagrande, Italy;
| | - Gina Watanabe
- John A. Burns School of Medicine, University of Hawai’i, Honolulu, HI 96813, USA; (G.W.); (A.C.); (C.O.)
| | - Andie Conching
- John A. Burns School of Medicine, University of Hawai’i, Honolulu, HI 96813, USA; (G.W.); (A.C.); (C.O.)
| | - Christian Ogasawara
- John A. Burns School of Medicine, University of Hawai’i, Honolulu, HI 96813, USA; (G.W.); (A.C.); (C.O.)
| | - Gianluca Scalia
- Department of Neurosurgery, Highly Specialized Hospital and of National Importance “Garibaldi”, 95122 Catania, Italy;
| | - Othman Bin-Alamer
- Department of Neurosurgery, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA;
| | - Ali S. Haider
- Department of Neurosurgery, The University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA;
| | - Maurizio Passanisi
- Trauma Center, Gamma Knife Center, Department of Neurosurgery, Cannizzaro Hospital, 95126 Catania, Italy;
| | - Rosario Maugeri
- Unit of Neurosurgery, Department of Experimental Biomedicine & Clinical Neuroscience, Azienda Ospedaliera Universitaria Policlinico, 90127 Palermo, Italy;
| | - Samer S. Hoz
- Department of Neurological Surgery, Padilla Hospital, Tucumán T4000, Argentina; (S.S.H.); (A.C.)
| | - Matias Baldoncini
- Department of Neurological Surgery, San Fernando Hospital, Buenos Aires B1646, Argentina;
| | - Alvaro Campero
- Department of Neurological Surgery, Padilla Hospital, Tucumán T4000, Argentina; (S.S.H.); (A.C.)
| | - Maurizio Salvati
- Department of Neurosurgery, Neuromed, IRCCS, Sapienza University of Rome, 86077 Pozzilli, Italy;
| | - Aaron A. Cohen-Gadol
- Department of Neurological Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA;
| | - Giuseppe E. Umana
- Trauma Center, Gamma Knife Center, Department of Neurosurgery, Cannizzaro Hospital, 95126 Catania, Italy;
- Correspondence: ; Tel.: +39-38-0332-5479
| |
Collapse
|
3
|
Zhao LY, Jiang YN, Wang YB, Bai Y, Sun Y, Li YQ. Coexistent vestibular schwannoma and meningioma in a patient without neurofibromatosis: A case report and review of literature. World J Clin Cases 2021; 9:7251-7260. [PMID: 34540986 PMCID: PMC8409193 DOI: 10.12998/wjcc.v9.i24.7251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 06/02/2021] [Accepted: 06/15/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The simultaneous occurrence of schwannoma and meningioma in the absence of neurofibromatosis (NF) or a previous history of irradiation is exceedingly rare, as only 10 intracranial cases have been reported to date. Herein, we report a case of a coexistent cavernous sinus meningioma and ipsilateral vestibular schwannoma (VS) in a female patient without NF or a history of exposure to irradiation. CASE SUMMARY A 63-year-old woman presented with progressive left-side hearing loss and tinnitus over the previous year. In the past 6 mo, she developed facial numbness and intermittent headaches. Magnetic resonance imaging showed two lesions that were located on the left side of the cerebellopontine angle and parasellar region. Both lesions were totally resected via the left retrosigmoid approach. Histopathological examination revealed a VS and a meningioma. The patient did not have a family history or clinical or radiological signs of NF. CONCLUSION The coincident occurrence of VS and meningioma within close vicinity is very rare, and the pathogenesis is unclear. A careful whole-body examination needs to be conducted to exclude NF. Surgical treatment with the goal of total tumor resection is the best therapy. Additional studies are needed for a better understanding of the mechanisms that lead to the development of tumor growth in multiple locations.
Collapse
Affiliation(s)
- Li-Yan Zhao
- Department of Clinical Laboratory, Second Hospital of Jilin University, Changchun 130041, Jilin Province, China
| | - Yi-Ning Jiang
- Department of Neurosurgery, First Hospital of Jilin University, Changchun 130021, Jilin Province, China
| | - Yu-Bo Wang
- Department of Neurosurgery, First Hospital of Jilin University, Changchun 130021, Jilin Province, China
| | - Yang Bai
- Department of Neurosurgery, First Hospital of Jilin University, Changchun 130021, Jilin Province, China
| | - Ying Sun
- Department of Clinical Laboratory, Second Hospital of Jilin University, Changchun 130041, Jilin Province, China
| | - Yun-Qian Li
- Department of Neurosurgery, First Hospital of Jilin University, Changchun 130021, Jilin Province, China
| |
Collapse
|
4
|
Surgical management of collision-tumors between vestibular schwannoma and meningioma in the cerebellopontine angle in patients with neurofibromatosis type 2. Acta Neurochir (Wien) 2019; 161:1157-1163. [PMID: 31044279 DOI: 10.1007/s00701-019-03933-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Accepted: 04/24/2019] [Indexed: 12/31/2022]
Abstract
INTRODUCTION When vestibular schwannoma (VS) collides with meningioma at the cerebellopontine angle (CPA), a particular threat occurs. Sudden acceleration of tumor growth and unpredictable involvement of cranial nerves results in a special environment that aggravates management. The goal of this study was to analyze the extent of resection, postoperative facial and cochlear function, surgical strategy, and survival rates in patients with neurofibromatosis type 2 (NF2) with meningioma-vestibular schwannoma (M-VS) collision tumors. METHODS A total of 1284 VS, including 165 NF2 VS were operated at our department between January 2004 and May 2018. Out of these cases, a group of six NF2 patients with seven M-VS collision tumors was found following careful analysis of neuroradiological data and pathological and surgical reports. Patients were evaluated for extent of tumor resection and, furthermore, postoperative facial and hearing function. RESULTS Six patients with NF2 with seven M-VS collision tumors were included in this study. Mean age was 32 ± 8.2 years. A gross total resection (GTR) of both colliding tumors was achieved in only one case, a GTR of the meningioma and a subtotal resection (STR) of the VS in four cases and in two cases only, the meningioma was removed. In five of the cases, facial function was intact or good (House and Brackmann grades I-II) at long-term follow-up (mean follow-up 22 months). No mortality occurred during follow-up. CONCLUSIONS Collision between M and VS at the CPA is a particular phenomenon in NF2 patients that may aggravate the situation with less favorable surgical outcome than NF-2 VS without meningioma.
Collapse
|
5
|
Peyre M, Bernardeschi D, Sterkers O, Kalamarides M. Natural history of vestibular schwannomas and hearing loss in NF2 patients. Neurochirurgie 2018; 64:342-347. [DOI: 10.1016/j.neuchi.2015.03.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 03/22/2015] [Accepted: 03/29/2015] [Indexed: 10/23/2022]
|
6
|
Graffeo CS, Perry A, Copeland WR, Giannini C, Neff BA, Driscoll CL, Link MJ. Synchronous Tumors of the Cerebellopontine Angle. World Neurosurg 2017; 98:632-643. [DOI: 10.1016/j.wneu.2016.11.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 10/31/2016] [Accepted: 11/01/2016] [Indexed: 01/28/2023]
|
7
|
Liebelt BD, Haider AS, Steele WJ, Krishna C, Blacklock JB. Spinal Schwannoma and Meningioma Mimicking a Single Mass at the Craniocervical Junction Subsequent to Remote Radiation Therapy for Acne Vulgaris. World Neurosurg 2016; 93:484.e13-6. [PMID: 27450976 DOI: 10.1016/j.wneu.2016.07.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 07/09/2016] [Accepted: 07/11/2016] [Indexed: 01/22/2023]
Abstract
BACKGROUND Schwannomas and meningiomas are relatively common tumors of the nervous system. They have been reported in the literature as existing concurrently as a single mass, but very rarely have they been shown to present at the craniocervical junction. CASE DESCRIPTION We present a rare and interesting case of a patient previously treated with radiation therapy for acne vulgaris and who presented to us with a concurrent schwannoma and meningioma of the craniocervical junction mimicking a single mass. CONCLUSIONS These tumors can be solitary or mixed masses, and are known to be associated with certain disease processes such as long-term sequelae of radiation therapy and neurofibromatosis type 2. The precise mechanism behind the formation of these tumors is unknown; however, molecular cues in the tumor microenvironment may play a role.
Collapse
Affiliation(s)
- Brandon D Liebelt
- Department of Neurosurgery, Houston Methodist Neurological Institute, Houston, Texas, USA.
| | - Ali S Haider
- Department of Neurosurgery, Houston Methodist Neurological Institute, Houston, Texas, USA
| | - William J Steele
- Department of Neurosurgery, Houston Methodist Neurological Institute, Houston, Texas, USA
| | - Chandan Krishna
- Department of Neurosurgery, Mayo Clinic, Scottsdale, Arizona, USA
| | - J Bob Blacklock
- Department of Neurosurgery, Houston Methodist Neurological Institute, Houston, Texas, USA
| |
Collapse
|
8
|
|
9
|
Abstract
A comprehensive discussion of neurofibromatosis 2 (NF2) is presented, including clinical characteristics, symptoms, diagnosis, tumor types, prevalence and incidence, genetic testing, imaging, treatment options, and follow-up management of NF2.
Collapse
Affiliation(s)
- Michael Hoa
- House Clinic, House Research Institute, 2100 West 3rd Street, Suite 111, Los Angeles, CA 90057, USA
| | | |
Collapse
|
10
|
Frassanito P, Montano N, Lauretti L, Pallini R, Fernandez E, Lauriola L, Novello M, Maira G. Simultaneously occurring tumours within the same cerebello-pontine angle: refining literature definitions and proposal for classification. Acta Neurochir (Wien) 2011; 153:1989-93; discussion 1993. [PMID: 21845369 DOI: 10.1007/s00701-011-1126-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Accepted: 08/02/2011] [Indexed: 12/14/2022]
Abstract
We report on an unusual case of a patient, not affected by neurofibromatosis, harbouring two radiologically spatially contiguous tumours within the same cerebello-pontine angle. Pathological findings were consistent with the diagnosis of two spatially distinct primary tumours, namely a meningioma and a schwannoma. We proposed a classification of tumours occurring at the same location consistent with the different spatial arrangement and histological nature of these conditions. The correct classification of these nosological entities will allow further more accurate evaluations of these cases in order to clarify the pathogenesis, prognosis and best treatment of each one.
Collapse
Affiliation(s)
- Paolo Frassanito
- Neurosurgery, Catholic University Medical School, Policlinico A. Gemelli Largo A. Gemelli, 8, 00168, Rome, Italy.
| | | | | | | | | | | | | | | |
Collapse
|
11
|
Peyre M, Goutagny S, Imbeaud S, Bozorg-Grayeli A, Felce M, Sterkers O, Kalamarides M. Increased growth rate of vestibular schwannoma after resection of contralateral tumor in neurofibromatosis type 2. Neuro Oncol 2011; 13:1125-32. [PMID: 21798887 DOI: 10.1093/neuonc/nor101] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Surgical management of bilateral vestibular schwannomas (VS) in neurofibromatosis type 2 (NF2) is often difficult, especially when both tumors threaten the brainstem. When the largest tumor has been removed, the management of the contralateral VS may become puzzling. To give new insights into the growth pattern of these tumors and to determine the best time point for treatment (surgery or medical treatment), we studied radiological growth in 11 VS (11 patients with NF2) over a long period (mean duration, 7.6 years), before and after removal of the contralateral tumor while both were threatening the brainstem. We used a quantitative approach of the radiological velocity of diametric expansion (VDE) on consecutive magnetic resonance images. Before first surgery, growth patterns of both tumors were similar in 9 of 11 cases. After the first surgery, VDE of the remaining VS was significantly elevated, compared with the preoperative period (2.5 ± 2.2 vs 4.4 ± 3.4 mm/year; P = .01, by Wilcoxon test). Decrease in hearing function was associated with increased postoperative growth in 3 cases. Growth pattern of coexisting intracranial meningiomas was not modified by VS surgery on the first side. In conclusion, removal of a large VS in a patient with NF2 might induce an increase in the growth rate of the contralateral medium or large VS. This possibility should be integrated in NF2 patient management to adequately treat the second VS.
Collapse
Affiliation(s)
- Matthieu Peyre
- Service de Neurochirurgie, Assistance Publique–Hôpitaux de Paris, Hôpital Beaujon, Clichy, France
| | | | | | | | | | | | | |
Collapse
|
12
|
|
13
|
Kodama K, Kazemi N, Ishii T. Bilateral cerebellopontine angle and multiple supratentorial masses. J Clin Neurosci 2006. [DOI: 10.1016/j.jocn.2006.03.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
14
|
Gelal F, Rezanko T, Uyaroglu MA, Tunakan M, Bezircioglu H. Islets of meningioma in an acoustic schwannoma in a patient with neurofibromatosis-2: pathology and magnetic resonance imaging findings. Acta Radiol 2005; 46:519-22. [PMID: 16224929 DOI: 10.1080/02841850510021382] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Mixed tumors of the cerebellopontine angle, composed of meningioma and schwannoma components, are extremely rare; so far, only 12 cases have been reported in the literature. They are thought to be exclusively associated with neurofibromatosis-2. We present a mixed tumor of schwannoma and meningioma in a patient with neurofibromatosis-2 and discuss the pathology and magnetic resonance imaging (MRI) findings in relation to the literature. Review of the literature shows that a typical MRI pattern has not been established for mixed tumors and it seems unlikely that a meningioma component can be differentiated within a schwannoma preoperatively.
Collapse
Affiliation(s)
- F Gelal
- Department of Radiology, Izmir Ataturk Education and Research Hospital, Izmir, Turkey.
| | | | | | | | | |
Collapse
|
15
|
Pallini R, Maira G, Pierconti F, Falchetti ML, Alvino E, Cimino-Reale G, Fernandez E, D'Ambrosio E, Larocca LM. Chordoma of the skull base: predictors of tumor recurrence. J Neurosurg 2003; 98:812-22. [PMID: 12691407 DOI: 10.3171/jns.2003.98.4.0812] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Chordomas of the skull base are generally regarded as slow-growing tumors; however, approximately 20% of these lesions have been shown to recur as early as 1 year postsurgery. The classic pathological paradigms are poor predictors of outcome, and additional markers are needed to identify patients at risk for early tumor recurrence. In this study the authors describe such a marker. METHODS In a series of 26 patients with chordomas of the skull base, the authors investigated the relationship between the biological behavior of the tumor, which was determined according to the interval for its recurrence and volume doubling time, and several pathological and molecular features, which included the histological variant, proliferative activity, mutation of p53 protein, expression of human telomerase reverse transcriptase (hTERT) messenger (m)RNA, loss of heterozygosity (LOH), and microsatellite instability. The major finding in this study was that hTERT mRNA expression in chordoma cells identifies those tumors that exhibit unusually fast rates of growth. The expression of hTERT mRNA was frequently associated with mutation of p53 protein, indicating that telomerase dysfunction combines with abnormal p53 function to initiate the unrestrained clonal expansion of the tumor cells. In cases in which the tumor was partially removed, mutation of p53 protein and expression of hTERT mRNA predicted increased doubling time for residual tumor as well as the probability of tumor recurrence. Cell proliferation, as investigated using the Ki-67 method, was significantly related to the tumor doubling time; however, the authors found that the pattern of cell proliferation was not homogeneous throughout the chordoma tissue, and that the proliferative index might change by a factor as high as 8 among different regions of the same tumor. The LOH and microsatellite instability do not seem to affect the prognosis of skull base chordomas. CONCLUSIONS Reactivation of telomerase in chordomas is a reliable predictor of outcome. The ability to predict the biological behavior of chordomas might have immediate implications in the management of this disease in patients who undergo surgery.
Collapse
Affiliation(s)
- Roberto Pallini
- Institute of Neurosurgery, Departmnet of Neurosurgery, Catholic University School of Medicine, Rome, Italy.
| | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Lüdemann W, Stan AC, Tatagiba M, Samii M. Sporadic unilateral vestibular schwannoma with islets of meningioma: case report. Neurosurgery 2000; 47:451-2; discussion 452-4. [PMID: 10942020 DOI: 10.1097/00006123-200008000-00037] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
OBJECTIVE AND IMPORTANCE Vestibular schwannomas with meningioma islets have been rarely reported in the literature; they have been observed only among patients with neurofibromatosis Type II. We present a case of a sporadic mixed tumor in a patient without neurofibromatosis Type II that was not suspected before surgery. CLINICAL PRESENTATION A 59-year-old female patient presented with clinical signs of progressive loss of hearing. Her family history did not include evidence of neurological diseases. Magnetic resonance imaging scans revealed a typical unilateral vestibular schwannoma. INTERVENTION The tumor presented with invasion of the surrounding arachnoid membrane, as well as Cranial Nerves VII and VIII. Preservation of the facial nerve with complete removal of the tumor was not possible. Therefore, Cranial Nerve VII reconstruction was performed. CONCLUSION The concomitant occurrence of schwannomas and meningiomas infiltrating the arachnoid membrane might be related to poor clinical outcomes for patients with neurofibromatosis Type II, with respect to preservation of facial and acoustic nerves. Among sporadic schwannomas, this phenomenon is extremely rare.
Collapse
Affiliation(s)
- W Lüdemann
- Department of Neurosurgery, Hannover Medical School, Germany.
| | | | | | | |
Collapse
|
17
|
Kida Y, Kobayashi T, Tanaka T, Mori Y. Radiosurgery for bilateral neurinomas associated with neurofibromatosis type 2. SURGICAL NEUROLOGY 2000; 53:383-89; discussion 389-90. [PMID: 10825525 DOI: 10.1016/s0090-3019(00)00174-9] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE The clinical course of bilateral acoustic tumors associated with neurofibromatosis (NF2) is generally troublesome, and no definite treatment strategy has been established. Follow-up results of bilateral acoustic tumors after radiosurgery are reported herein. METHODS The current indications for radiosurgery are 1) a growing tumor less than 30 mm in mean diameter, 2) the ipsilateral ear has no serviceable hearing, and 3) there is risk of brain stem compression or brain stem dysfunction. Twenty cases of bilateral acoustic tumors were treated with the gamma knife, including 7 males and 13 females. The mean age was 38.2 years and the mean tumor size 24.4 mm. The tumors were treated with mean maximum and marginal doses of 26.8 Gy and 13.0 Gy, respectively. Among them, 12 patients had profound hearing loss in the ipsilateral (treated) ear, but the other 8 had serviceable hearing. RESULTS Tumors treated with radiosurgery showed central necrosis in 60% of the cases at 6 months and in 70% at 9 months after radiosurgery. Thereafter, the tumors often demonstrated slow regression. The rate of tumor shrinkage was 20% at 12 months, 35% at 24 months, and almost 60% at 36 months. At the last follow-up (mean 33.6 months), the tumors demonstrated shrinkage in 50% and tumor control in 100%. The contralateral tumors were stable in 12 (60%) and enlarged in 8 (40%). Preservation of serviceable hearing ipsilaterally was obtained in 33.3%. Deterioration of ipsilateral facial nerve function, either in the natural course or as a complication, occurred in 10%. CONCLUSIONS Because of good tumor control and tumor shrinkage as well as an acceptable complication rate, radiosurgery should be incorporated in the treatment strategy for bilateral acoustic tumors associated with NF2.
Collapse
Affiliation(s)
- Y Kida
- Department of Neurosurgery, Komaki City Hospital, Komaki City, Japan
| | | | | | | |
Collapse
|