Case 1 male, 28 years old, sudden coma while eating at about 2:30 pm on March 16, 2011, was rushed to our hospital for cranial CT examination: right temporoparietal cerebral hemorrhage broke into the ventricle, the bleeding volume was about 100 ml, the patient’s pupil on one side was dilated, brain hernia was formed, consciousness was in moderate coma, life was in danger at any time, time is life, the neurosurgical staff actively prepared before surgery and immediately went to the operating room to perform craniotomy. The patient’s life was finally preserved, but what caused the brain hemorrhage? The patient was so young and had no history of hypertension. In order to clarify the cause of the hemorrhage, we performed CTA and MRA examinations on the patient and found that there was a malformed blood vessel on the right top of the patient, so the culprit of the brain hemorrhage was finally found. The patient is now able to walk and live normally. Case 2 male, 44 years old, was admitted to the emergency room at 8:00 p.m. on July 5, 2011, and his family complained that the patient had a sudden headache and vomiting around 5:00 p.m., and soon lost consciousness. Three weeks after admission, a cerebral angiogram was performed, and a malformation of the right parietal cerebral artery and vein, about 4×4 cm in size, was found, so after adequate preoperative preparation, a craniotomy was performed under general anesthesia to remove the malformed vascular mass. Although the final results of these two patients are very satisfactory, we still cannot take it lightly because the disease is insidious, the early symptoms are not obvious, the onset of the disease is sudden, if the treatment is not timely will soon lead to the death of the patient, and in the whole treatment process, any part of the problem, the light may cause very serious neurological deficiency, the heavy may endanger the patient’s life, so what exactly is the brain arteriovenous malformation (AVM)? What kind of disease is AVM? AVM is one of the most common and dangerous intracranial vascular malformations. It is a mass of abnormally developed pathological cerebral vessels, supplied by one or several arteries, which do not pass through the capillary bed and drain directly into the veins. Smaller malformed vascular masses are less than 1 cm in diameter and larger ones can be up to 10 cm in diameter, containing brain tissue that can grow in size as the body develops. Intracranial AVMs can occur in any part of the cerebral hemisphere. The disease is slightly more common in men than in women, and 64% develop before the age of 40. The main hazard of AVM is intracranial hemorrhage, and common symptoms include headache and seizures. Early detection and early treatment are crucial because once bleeding occurs, it can be directly life-threatening or cause very severe neurological damage. If someone has frequent head discomfort, seizures, etc., it is best to go to the hospital for a checkup. Common tests include MRI (MRI + MRA) and CTA, and if necessary, cerebral angiography (DSA), which is the “gold standard” for diagnosing AVM. Surgical resection is the most thorough method to treat AVM, and the resection effect is still relatively satisfactory with the application of microsurgery technique. Other treatment methods include radiation therapy and interventional therapy.