We often encounter patients who are diagnosed with cerebral aneurysm after CT or MRI examination because of headache or subarachnoid hemorrhage because of sudden and severe headache. Patients and family members are afraid that it is a tumor that cannot be cured because of the word “aneurysm”, and some patients even give up treatment. In fact, cerebral aneurysm is not a tumor, but a local abnormal expansion of cerebral artery wall, which is related to local weakness of artery wall and abnormal blood flow and blood pressure in artery. Most patients with cerebral aneurysms have no clinical symptoms, while some have recurrent headaches or symptoms of neurological compression such as limited eye movement and drooping eyelids to detect the aneurysm. A survey in China found that about 10% of middle-aged and elderly people with asymptomatic cerebral aneurysms, or one in 10, may have a cerebral aneurysm. The greatest risk of cerebral aneurysm is cerebral hemorrhage, which manifests as severe headache, vomiting, confusion, coma, respiratory and cardiac arrest, or hemiplegia and aphasia if the hemorrhage involves brain tissue. About one-third of patients die in the first bleeding, 50-70% in the second bleeding, and more than 90% in the third bleeding. It is the principle of diagnosis and treatment to identify the site and cause of bleeding as early as possible and to relieve the risk of bleeding as early as possible. Cerebrovascular CTA and MRA can provide the initial diagnosis, and DSA (cerebral angiography) can be used to perform interventional treatment while clarifying the cause of bleeding. More than a decade ago, the main treatment method for cerebral aneurysm was craniotomy to clip the aneurysm, which was relatively more traumatic and difficult for some special types of aneurysms such as wide neck aneurysm and pike aneurysm. With the development of endovascular interventional techniques and materials, more and more cerebral aneurysms can be treated by this technique. Interventional treatment is an extremely minimally invasive technique that requires only a puncture at the root of the patient’s thigh (femoral artery) and then delivers a catheter to complete the filling of the aneurysm cavity so that blood flow no longer impinges on the aneurysm and the risk of bleeding is removed (similar to filling a hole in a pavement with rocks to restore the roadway), without opening the skull and exposing brain tissue, and with little intraoperative bleeding. Nowadays, various complex cerebral aneurysms that are difficult to be treated by surgery can be accomplished by interventional treatment. However, the cost of interventional treatment is relatively expensive, and the possibility of recurrence exists in about 20% of aneurysms after interventional treatment.