Gamma knife surgery for skull base meningiomas

Area of Science:

• Neurosurgery
• Radiation Oncology
• Oncology

Background:

• Skull base meningiomas pose significant treatment challenges due to their proximity to critical neurovascular structures.
• Microsurgical resection can lead to substantial morbidity and is associated with notable recurrence rates.

Observation:

• This study retrospectively reviewed 255 patients with skull base meningiomas treated between 1989 and 2006.
• Patients received either upfront Gamma Knife surgery (GKS) or GKS following microsurgical resection, with a minimum 24-month follow-up.
• Tumor control and neurological status were assessed clinically and radiographically.

Findings:

• 86% of patients showed stable or decreased tumor volume post-GKS, with 99% progression-free survival at 3 years.
• 90% of patients experienced no change or improvement in neurological condition.
• Factors predicting tumor progression included older age (>65) and lower radiation dose to the tumor margin.

Implications:

• Stereotactic radiosurgery, including GKS, demonstrates high efficacy in controlling skull base meningiomas and preserving neurological function.
• Optimal radiation dosing and specific tumor locations (cerebellopontine angle, parasellar, petroclival) are associated with improved outcomes.
• GKS is a viable option for managing skull base meningiomas, either as a primary treatment or adjunct to surgery.