Fig. 1

Flow chart of patients included in the study. From June 2020 to March 2021, a total of 360 patients underwent cervical cerebral angiography were screened. During the screening, those with incomplete clinical, imaging and laboratory data, no intracranial artery stenosis, chronic total occlusion or hypoplasia of arteries, cervical vertebral artery stenosis, acute/chronic inflammatory or wasting diseases, liver and kidney insufficiency, tumor or autoimmune diseases will be excluded, 150 cases were finally included