An intracranial aneurysm is an abnormal bulge in the blood vessel wall of an intracranial artery. It resembles a car tire with a small bubble slowly bulging out from a weak spot. The etiology of aneurysm is not clear. It is classified into saccular, spindle-shaped and intercalated aneurysms according to the morphology, and into internal carotid artery aneurysm, anterior communicating artery aneurysm, middle cerebral artery aneurysm, posterior communicating artery aneurysm, vertebrobasilar or posterior cerebral artery aneurysm, and basilar artery apical aneurysm according to the preferred site. Intracranial aneurysms are more common in middle-aged and elderly people aged 60-79 years old, with more women than men. They are classified into unruptured aneurysms and ruptured aneurysms according to whether the aneurysm is ruptured or not. Intracranial aneurysms are one of the most common causes of subarachnoid hemorrhage. Patients with ruptured aneurysms have clinical manifestations of severe headache, nausea and vomiting, cervical ankylosis, which may be accompanied by focal neurological deficits, or in severe cases, impairment of consciousness, hemiparesis, seizures or even deactivation of the brain. Unruptured aneurysms may have no clinical manifestations or may show corresponding focal neurological deficits due to the occupying effect of the aneurysm. Diagnostic tools for intracranial aneurysms include head CT arteriography (CTA), magnetic resonance arteriography (MRA) and cerebral arteriography (DSA), of which cerebral arteriography is the gold standard for the diagnosis of intracranial arteriovenous aneurysms. Treatment of intracranial aneurysms includes craniotomy or endovascular intervention. Since endovascular intervention is a minimally invasive procedure, it is less invasive and facilitates early recovery, so it has become the most common treatment method for intracranial aneurysms in recent years.