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JRSBRT 1.2, p. 123-131

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Gamma knife radiosurgery of tentorial meningiomas
Robert M. Starke, Claire Olson, James H. Nguyen, Jessica Rainey, Brian J. Williams, Jason P. Sheehan

Objective: Tentorial meningiomas are complex lesions that may not always be completely resected without significant morbidity or mortality. In this study, we evaluate the outcomes of tentorial meningiomas treated with Gamma Knife radiosurgery (GKRS).

Methods: We performed a retrospective review of a prospectively compiled database evaluating the outcomes of 35 patients with tentorial meningiomas treated at the University of Virginia from 1990 to 2006. There were 29 females and 6 males with a median age of 60 years (range 21-82). Twenty were treated with primary radiosurgery, and 15 patients were treated with adjuvant radiosurgery after surgical resection. Patients were assessed clinically and radiologically at routine intervals following GKRS. Kaplan-Meier analysis was used to assess tumor progression.

Results: The mean follow-up was 5 years (range 2-16 years). The mean pre-radiosurgery tumor volume was 5.1 cc (range 0.7-27.3cc). At last follow-up, 31 patients (89%) displayed either no growth or a decrease in tumor volume. Four (11%) patients displayed an increase in volume. Kaplan Meier analysis demonstrated radiographic progression free survival at 3, 5, and 10 years to be 96%, 91%, and 73% respectively. At the last clinical follow-up, 33 patients (94%) demonstrated no change or improvement in their neurological condition and 2 patients clinically declined (6%).

Conclusion: GKRS offers an acceptable rate of tumor control for tentorial meningiomas, and accomplishes this with a low incidence of new or worsening neurological deficits.

Keywords: radiosurgery, gamma knife, meningioma, tentorium

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