Can you tell me about stereotactic radiosurgery for a brain tumor?

Certainly: Have you ever burned a leaf with a magnifying glass on a hot summer's day? That is how radiosurgery works. It focuses radiation from all different angles onto the tumor, making the dose of radiation to the tumor very high while making the dose of radiation to surrounding normal tissue very low. Radiosurgery is best for tumors with a low risk of spreading.