Craniotomy for patients with cerebrovascular malformation is basically a general anesthesia craniotomy, the specific risks are: 1, anesthesia risk: anesthesia is mainly for the elderly or children, mainly depending on the usual health status. If you have severe hypertension, coronary artery disease, pulmonary heart disease and other underlying diseases, especially in elderly patients, if you have serious underlying diseases in the past, there is a certain risk of doing general anesthesia surgery; 2, surgical risks: such as hematoma, bleeding at the surgical site or distal site bleeding, post-surgical infection, especially in elderly patients who are bedridden for a long time, prone to pneumonia, lung infection, decreased resistance may cause wound infection leading to intracranial infection. Brain hemorrhage may also block the cerebrospinal fluid circulation pathway and cause hydrocephalus later in life. In some regular large neurosurgery centers, these risks can be minimized through regular perioperative management, regular surgical planning and surgical execution.