Cerebral aneurysm (aneurysm) is a major disease that seriously threatens human life. Once ruptured and bleeding, it is often life-threatening, and some of them do not even give people a chance to be rescued. With the advancement of technology, CT and MR angiography have made it possible to detect aneurysm, but only cerebral angiography (DSA) is the gold standard for the diagnosis of cerebral aneurysm. Cerebral aneurysms can be insidious for a long time, sometimes accompanied by a history of headache. 40-60 years old is the peak age of incidence. The onset of cerebral aneurysm rupture is rapid, mostly in the form of cerebral hemorrhage, especially subarachnoid hemorrhage; others develop in the form of cranial nerve damage, such as unilateral ophthalmic nerve palsy, manifested as eyelid ptosis; a few have other symptoms such as cerebral infarction and cerebral ischemia. Brain aneurysms are mainly seen at the bifurcation of the cerebral arteries, with about 4/5 arising in the anterior circulation and 1/5 occurring in the posterior circulation. Exploring the cause of the disease has been the direction of research efforts by doctors and medical researchers, and it is also a problem that patients are often confused about. It is currently believed that alterations in hemodynamics (e.g., chronic hypertension) based on cerebral atherosclerosis are the main cause of cerebral aneurysms. Other factors such as intracranial inflammation, vascular malformations, and lesions of veins and venous sinuses are also relevant, and the relationship with genes is also being studied. Diagnosis is the prerequisite and treatment is the key. Once the aneurysm is clearly identified, it must be treated actively. The mortality rate of the first rupture of cerebral aneurysm is about 30%, the second rupture is about 60%, and the third rupture is basically not saved. There are two treatment options, one is craniotomy and the other is neurointerventional embolization. The advantages of craniotomy are that the aneurysm can be completely clamped and the cost is relatively low. Disadvantages: large trauma, bleeding, long hospital stay; difficult or impossible to perform surgery in certain areas. Advantages: Interventional embolization can deal with lesions in areas difficult to reach surgically; less trauma, less bleeding, relatively short hospital stay, unruptured aneurysms can be discharged three days after treatment. Disadvantages: individual patients are unable to perform interventional treatment due to pathway vessel stenosis and variation; the cost is relatively high. As for the risks, surgery has surgical risks and intervention has interventional risks, and it is impossible to simply compare the two risks. Prognosis: The prognosis of ruptured and unruptured aneurysms treated as described above is good, while the prognosis of secondary rupture is poor. The rupture rate of untreated aneurysms is about 50% within six months, and the risk of rupture increases by 1~2% every year thereafter.