OUTLINE: Patients undergo stereotactic head frame placement, followed by stereotactic radiosurgery using Gamma Knife, on day 1. Quality of life is assessed one week prior to and one week after treatment, and then at 2, 4, 6, 8, 10, and 12 months. Patients are followed at one week, at 2, 4, 6, 8, 10, and 12 months, every 4 months for one year, and then every 6 months for 3 years.