Radiosurgery is generally performed when a patient has:

• Lesions with well-defined margins
• Less than 3 cm in diameter
• Risk of open surgery is unacceptable

The specific conditions that may require stereotactic radiosurgery treatments are:

• Metastatic tumors
  - Solitary
  - Multiple
• Arteriovenous malformations
  - Small 
  - Deep-seated
• Skull base tumors
  - Meningiomas
  - Acoustic neurinomas
  - Chordomas
  - Craniopharyngiomas
  - Selected pituitary adenomas
• Pineal region tumors
  - Germinomas
  - Pinealocytomas
  - Pinealoblastomas
  - Gliomas
  - Yolk Sac Tumors
  - Malignant Teratomas
• Intra-axial Primary Tumors
  - Circumscribed High Grade Gliomas