A radiation therapy technique that uses a large number of narrow, precisely aimed, highly focused beams of ionizing radiation. The stereotactic radiosurgery beams are aimed from many directions circling the head, and meet at a specific point.
Stereotactic radiosurgery is not considered an invasive surgical procedure, but a radiation therapy that focuses high-powered x-rays onto a small area. Typical radiation therapy directs radiation to the tumor and nearby tissue, but stereotactic radiosurgery concentrates the radiation onto the abnormal area only. It requires both a neurosurgeon and a radiotherapist in most cases.