1. Medical device, namely clinical linear accelerator for use in radiosurgery

2. Radiosurgery is an effective alternative treatment for acoustic neurinomas with exceptionally low mortality and morbidity.

3. Hydrocephalus formation is not a typical complication but is a symptom that may aggravate after radiosurgery.

4. Stereotactic radiosurgery (SRS) is a neurosurgical field that has become increasingly important in the treatment of acoustic neuromas.

5. Methods Ten patients with a large portion of brain tumor Abutting the OAR previously treated with GK stereotactic radiosurgery (SRS) were selected.