A single institution retrospective study of efficacy and complications perspective of Gamma Knife Radiosurgery for benign skull base meningioma: A 12-year follow-up

Abstract

Background and Objectives: Gamma knife radiosurgery (GKRS) has established its role as an effective treatment modality for inaccessible, recurrent, and residual benign skull base meningioma. Therefore, it is necessary to study the outcome in the long term. The current retrospective study aims to analyze and report the clinical and radiological outcomes after long-term follow-up of GKRS for skull base meningiomas >= 12 years. Patients and methods: The present study was conducted on 106 consecutive patients harboring benign skull base meningiomas treated by GKRS at our IMC center between 2005 and 2012 and was followed till the end of 2023. Results: After a median follow-up of 13 years (3.6-18 years), a tumor control rate was reported in 88.7% of patients (n 94/106). Recurrences and tumor progression occurred in 11.3% (n 12/106) at a median follow-up period of 5.4 years (3–10.3 years). The 3, 5-, 10-, 12-and 15-year actuarial tumor control rate was 100%, 95.3%, 89.7%, 88.7%, and 78.1% respectively. Conclusions: The current retrospective study provides a long-term 12-year follow-up and comprises one of the longest follow-up studies of GKRS-treated benign skull base meningiomas. The current series documents a persistent long-term high local tumor control and an acceptable low incidence of neurological deficits. Benign skull base meningioma volume variant at the time of GKRS is a statistically significance predictor factor for tumor control at long-term outcomes.