Gamma knife is not a real intracranial scalpel, so collectively known as gamma knife because it is as sharp as a scalpel. The principle is mainly by focusing the gamma rays together, the peripheral dose is very low, so the middle energy is high enough to kill the tumor cells, like a scalpel sharp, the edge dose is very small for the peripheral nerves or blood vessels to play a protective role. So in the treatment of three major types of diseases, including tumor diseases, vascular diseases, functional diseases: 1, tumor diseases: including benign intracranial tumors, malignant tumors, benign tumors such as auditory neuroma, pituitary tumors, meningioma, these benign tumors can do gamma knife, malignant tumors, including metastases, such as craniopharyngioma, chordoma, and intracranial nasopharyngeal carcinoma can do Treatment; 2, vascular diseases: the most common is the brain arteriovenous malformation and cavernous hemangioma two types; 3, functional diseases: mainly including trigeminal neuralgia, Parkinson’s, epilepsy, do the most patients with trigeminal neuralgia. So gamma knife treatment diseases are these three major categories.