What is an aneurysm and what are its risks? The term “aneurysm” is often misunderstood and confused with “tumor”, but it is actually a different thing. The medical definition of an aneurysm is an abnormal localized enlargement of an artery in the brain. 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 inner tube is filled with gas. If there is localized wear on the inner tube, a packet will bulge out of the worn area when it is inflated, forming an “aneurysm”, where the wall of the inner tube becomes weak, and if it ruptures, an “aneurysm rupture and bleeding” occurs. 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, it is important to provide the necessary treatment. Firstly, during the acute stage, the blood stimulates the blood vessels at the base or surface of the brain, causing cerebral vasospasm leading to cerebral infarction and brain damage manifestations such as increased impairment of consciousness, hemiparesis and aphasia; secondly, because such patients are most likely to relapse at 2-4 weeks, making the condition worse and leading to death. Therefore, even if the patient’s self-perceived symptoms disappear after medical treatment and is considered cured, appropriate surgical treatment should be given. 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. Endovascular treatment has been adopted as the preferred method of treating aneurysms in Europe and the United States. Endovascular treatment can also be effective for aneurysms that are difficult to reach by opening the skull, for patients with poor general condition that cannot tolerate surgery, or for patients in the acute phase of bleeding. Endovascular treatment for cerebrovascular disease reflects the development trend from inoperable to operable, from less invasive surgery to minimally invasive surgery, and 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.