BAVM is an abnormal communication between arteries and veins that occurs between 45 and 60 days of embryonic development, where there is no normal capillary network between arteries and veins, but only an abnormal mass of malformed vessels. The AVM is graded by the clinician according to the size, location and depth of the AVM supplying artery, the aberrant mass, and the depth of the draining vein. The Spetzler grading method is often used (one grade for every 3 cm of the size of the mass, one grade for the location in the functional area, and one grade for the deeper draining veins, for a total of five grades). The lower the grade, the better the treatment; the higher the grade, the more difficult the treatment. Cerebral AVM is usually diagnosed in the following cases: 1. Sudden severe headache during exercise or emotional excitement, often accompanied by vomiting, mental clarity can be awake or blurred or even coma, numbness or weakness of the arms and legs, and in severe cases, neurological dysfunction such as hemiparesis and inability to speak. Most of them develop in adolescence. 80%-90% of patients with the first bleeding of AVM can survive; 2. Limb convulsions, also known as seizures. More than half of BAVM can have seizures; 3. Headache, more than half of the patients have a history of headache. The headache is often on one side and may resolve on its own; 4. Gradually increasing neurological impairment. In the presence of the above, the doctor will recommend the patient to undergo cranial CT, magnetic resonance imaging (MRI), and especially cerebral angiography (DSA) to clarify the arteries supplying the AVM, the size and location of the malformation mass, and the drainage veins to confirm the diagnosis. In terms of treatment, there are currently three types of treatment methods: 1, craniotomy; 2, intravascular embolization therapy, also known as interventional therapy, by injecting ONYX and other gum into the malformation mass to make the malformation mass get fully or partially occluded (in recent years, the development of rapid); 3, stereotactic radiosurgery treatment, also known as gamma knife and radio-wave knife. These methods can also be applied in combination, that is, comprehensive treatment, usually with better results.