颈内动脉狭窄发生率较高,造成的危害也较大。Alter 等(1972)将血栓性或栓塞性脑梗塞患者60例做脑血管造影,全面观察了颅内四根血管,有血管狭窄者达42例,其中有颈内动脉狭窄者占11例。有人报告颈内动脉狭窄达到原管腔的25％,还有人报告颈内动脉狭窄达原管腔的50％时即可引起临床症状。其主要临床症状为短暂性局部脑缺血发作(TIA)及卒中。颈内动脉狭窄目前 A higher incidence of carotid artery stenosis, resulting in greater harm. Alter et al. (1972) performed cerebral angiography in 60 patients with thrombotic or embolic cerebral infarction. A total of 42 intracranial vessels were observed. There were 42 patients with vascular stenosis, of whom 11 had internal carotid artery stenosis. It was reported that the stenosis of the carotid artery reached 25% of the original lumen, while others reported that the carotid artery stenosis reached 50% of the original lumen can cause clinical symptoms. The main clinical symptoms are transient ischemic attack (TIA) and stroke. Internal carotid artery stenosis at present