The greatest danger of cerebrovascular malformation is bleeding from ruptured blood vessels. Depending on the site of hemorrhage, it can be divided into cerebral parenchymal hemorrhage and subarachnoid hemorrhage. Common clinical manifestations include facial palsy, speech difficulty, swallowing difficulty and choking on water, eye movement disorder, hemiparesis, aphasia, and sensory abnormalities. The specific clinical symptoms vary from one site of hemorrhage to another. For example, brainstem hemorrhage can be directly fatal; lobar hemorrhage, which is relatively low risk, can be drained by cone cranial drilling and cone laparotomy. In addition, cerebrovascular malformations can lead to narrowing, spasm, and occlusion of blood vessels, causing ischemic cerebrovascular disease, such as cerebral infarction.