SRS :
Stereotactic radiosurgery is a form of radiation therapy that delivers high doses of radiation in the form of tiny beams of energy. Neurosurgeons and radiation oncologists use SRS to treat brain tumors and small tumors in other parts of the body. It reduces the damage to the healthy tissue. Types of stereotactic radiosurgery include gamma knife to treat brain tumors and brain issues, stereotactic body radiation therapy for small cancerous tumors, proton therapy, and linear accelerator. Conditions treated by SRS are chordoma, metastatic brain tumors, pineoblastoma, acoustic neuroma, craniopharyngioma, hemangioblastoma, meningioma and paraganglioma, Parkinson's disease, trigeminal neuralgia, nasopharyngeal cancer, nonsmall cell lung cancer, liver cancer and pancreatic cancer. Side effects may include hair loss, headaches, skin changes, diarrhea, nausea and vomiting. Risks include memory loss, difficulty in processing information and trouble concentrating.