What is cerebral angiography? Cerebral angiography is a method of diagnosing cerebrovascular diseases by injecting iodine-containing contrast into the blood vessels through a catheter to visualize the cerebral blood vessels, and then clearly displaying the morphology of the cerebral vessels through DSA machine with rapid and continuous film taking and photo processing. Cerebral angiography can not only show the morphological changes of the blood vessels themselves, such as dilatation, malformation, spasm, stenosis, vascular occlusion, hemorrhage, etc., but also determine the presence or absence of occupancy according to the changes in the position of the blood vessels. Therefore, it has special significance in diagnosing the lesions of intracranial blood vessels themselves and can be said to be the “gold standard” for the diagnosis of cerebrovascular diseases. Which patients should have cerebral angiography? (1) Patients with cerebral infarction, transient ischemic attack and central vertigo; (2) Patients who are considered to have vascular stenosis or occlusion by cervical vascular color ultrasound or transcranial Doppler ultrasound (TCD); (3) Patients with cerebral vascular stenosis, occlusion, aneurysm, arteriovenous malformation and arteriovenous fistula by MRI or CT angiography; (4) Patients with subarachnoid hemorrhage, cerebral hemorrhage or ventricular hemorrhage; (5) Patients with CT or magnetic resonance imaging (MRI). (5) patients with CT or MRI suggesting possible smog; (6) patients with acute ischemic cerebrovascular disease requiring arterial thrombolysis; (7) patients considering acute ophthalmic artery occlusion; (8) patients with suspected intracranial venous sinus thrombosis; (9) patients with headache accompanied by cerebral tinnitus, unilateral erogenous proptosis, unilateral arteriovenous nerve palsy, and other patients considering cerebrovascular disease with negative conventional tests; (10 ) Patients with brain tumors to be surgically removed; (11) Patients with other blood flow-rich lesions on the head and face before resection. In what cases should cerebrovascular stenting be performed? Endovascular stenting is currently recognized as the most effective treatment for ischemic cerebrovascular disease caused by arterial stenosis. Asymptomatic stenosis ≥ 70% or symptomatic stenosis ≥ 50% of the extracranial segment of the internal carotid artery and vertebral artery are indications for cerebrovascular stenting.