Intracranial atherosclerotic stenosis (ICAS) is one of the leading causes of ischemic strokes, with obvious differences among different races; 30% to 50% of Asian stroke patients suffer from intracranial atherosclerosis. The incidence of intracranial atherosclerosis is 46.6% in Chinese patients with ischemic stroke or transient ischemic attack (TIA). Patients suffering from ICAS have more severe symptoms, longer hospitalization, and a higher risk of recurrent strokes, with the recurrence rate positively related to the degree of stenosis ^[1].

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