To evaluate the degree of stenosis and pathology of the lesion and intracranial collateral circulation in the patients of carotid stenosis who underwent endarterectomy.

• 观察颈部动脉狭窄程度、病变性质和颅内侧枝循环建立，比较无创检查和有创检查所见，及其与脑梗塞发生的关系。