What is an intracranial aneurysm An intracranial aneurysm is an abnormal bulge (non-neoplastic) in the wall of an intracranial artery that is rarely detected until it ruptures because the aneurysm is usually small and does not cause clinical symptoms. A ruptured aneurysm can cause serious pathological changes such as subarachnoid hemorrhage (SAH). The mortality rate of ruptured aneurysms is about 30-40% at first rupture and up to 60% at second rupture, and the disability rate of survivors is very high. Therefore, intracranial aneurysm is also compared to the “time bomb” in the brain. Endovascular treatment of intracranial aneurysms is performed by puncturing the femoral artery at the base of the patient’s thigh, using a catheter to enter the neck through the vascular system, and using a microcatheter to reach the aneurysm, filling the aneurysm with a tiny soft platinum ring through the microcatheter to prevent blood flow into the aneurysm and thus prevent bleeding or rebleeding. Endovascular embolization is a minimally invasive operation that does not require head shaving and exposure of brain tissue, is minimally invasive, has few complications, requires no blood transfusion, and results in rapid postoperative recovery and a short hospital stay (if the aneurysm is unruptured or if the bleeding from a ruptured aneurysm is not in the acute stage, the patient can be discharged 3 days after surgery), but is relatively expensive. Intracranial aneurysm clamping surgical treatment Through craniotomy, the aneurysm and the aneurysm-carrying artery are found in the brain tissue gap, and aneurysm clamps are placed at the neck of the aneurysm to avoid rebleeding of the aneurysm. The efficacy (prevention of rebleeding) is indeed, and the cost is relatively low, but the disadvantages are more traumatic and the postoperative recovery is slow. What is the prognosis of patients with intracranial aneurysm? The prognosis of patients with ruptured and bleeding aneurysm depends on the patient’s condition before treatment, such as (1) the degree of preoperative mental coma; (2) the location, size and shape of the aneurysm; (3) the amount and location of bleeding; (4) the presence of complications such as cerebral vasospasm and hydrocephalus; and (5) the presence of other comorbidities such as hypertension and heart disease. Endovascular embolization or surgical clamping can only reduce the chance of re-rupture and bleeding, but cannot reverse the brain damage caused by aneurysm rupture and bleeding. For intracranial aneurysms that have not ruptured or are not in the acute stage of rupture and bleeding, endovascular embolization or craniotomy for aneurysm clamping are effective. Review of CTA (MRA or DSA) is required 3-6 months after discharge from hospital.