The term “aneurysm” is often misunderstood and confused with “tumor”, but it is actually a different thing. The medical definition of aneurysm is a localized abnormal enlargement or protrusion of the cerebral artery, which may be more accurately defined as “arterial bubble”. In layman’s terms, the arterial wall is like the inner tube of a bicycle, except that the artery is filled with blood and the tire is filled with gas. If the inner tube is locally worn, a bag will bulge out at the worn area when it is inflated, and will leak when it ruptures; similarly, a bag will bulge out at the weak area of the arterial wall by the impact of blood flow, which is called “aneurysm”, and will lead to subarachnoid hemorrhage after rupture. According to statistics, once an aneurysm ruptures, the mortality rate is 40% for the first bleed and 60% for the second bleed. Thirty-five percent of patients who survive the first bleed with conservative treatment will die within a year from another bleed, and 51% will die within 5 years. Severe disability or death occurs within 1 year after an aneurysm hemorrhage in more than 60% of patients. Therefore, cerebral angiography should be performed in a timely manner for such patients to obtain a clear diagnosis and timely treatment in order to obtain satisfactory results. How to treat aneurysm Aneurysm is a disease with a high mortality and disability rate among young and middle-aged patients. Once an aneurysm is diagnosed, the necessary surgical treatment must be given urgently. There are two reasons for this: first, in the acute stage, the bleeding stimulates the blood vessels at the base of the brain or on the surface of the brain, causing cerebral vasospasm leading to cerebral infarction, which results in brain damage such as increased impairment of consciousness, hemiparesis, and aphasia, etc. Only by dealing with the aneurysm can we feel confident to perform lumbar puncture or extraventricular drainage to release the bleeding in the subarachnoid space and reduce brain damage; second, such patients are most likely to bleed again within 2 weeks, which can worsen their condition and lead to death. The aim of surgical treatment is to remove the cause, i.e., to eliminate the break in the arterial wall, in an effort to prevent re-rupture of the aneurysm. It includes direct cranial clamping of the aneurysm neck in microneurosurgery and intracapsular embolization of the aneurysm in endovascular neurosurgery or a combination of the two. Endovascular treatment of aneurysms involves delivering a microcatheter into the aneurysm and occluding the aneurysm with materials such as spring coils and medical adhesive, thereby preventing bleeding and recurrence of the aneurysm and allowing the patient to heal. Some European and American countries have adopted endovascular neurosurgery as the method of choice for treating aneurysms. Endovascular treatment can also be effective for aneurysms that are difficult to reach by opening the skull, for patients in poor general condition who cannot tolerate surgery, or for patients in the acute phase of bleeding. Endovascular neurosurgery for the treatment of cerebrovascular disease reflects the development trend from inoperable to operable, from traumatic surgery to minimally invasive surgery, from minimally invasive to non-invasive, with the outstanding advantages of less trauma, less pain, less danger, and higher success rate, which is widely accepted by patients.