A Study of Stereotactic Radiosurgery (SRS) in People With Brain Cancer Having Tumor Resection Surgery

The researchers are doing this study to see if treating people\'s brain tumors with stereotactic radiosurgery (SRS) before tumor resection surgery will prevent cancer cells from spreading to other areas of the brain, including the fluid and lining around the brain, during surgery, and lead to better surgical outcomes and fewer complications after surgery (post-surgery complications). Only one brain tumor (the index tumor) will be treated with the study radiosurgery and then removed by surgery. If there are other brain tumors, they will not be removed by surgery in this study, although they may be treated separately with standard radiation if the doctor decides it is needed.