You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is 'Gamma knife' is a term used to denote which of the methods of treatment? and explain in detail?
Gamma Knife radiosurgery allows for the destruction of a brain lesions without cutting the skin. By focusing many small beams of of radiation on abnormal brain tissue the abnormality can be destroyed while preserving the normal surrounding structures. The Gamma Knife uses 201 narrow beam Cobalt 60 sources all aimed at a common focal point. When the intracranial abnormality is placed at this focal point it can be effectively destroyed. Conditions treatable with Gamma Knife Radiosurgery include: metastatic brain tumors, aeriovenous malformations, acoustic neuromas, meningiomas, pituitary adenomas, and tic doulouroux (trigeminal neuralgia). Patients with malignant tumors, including gliomas and astrocytomas, may also be candidates for Gamma Knife treatment.