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Symptoms and lesion characteristics
| Parameters | Number (%) |
|---|---|
| Asymptomatic | 7 (30.4) |
| Symptomatic | 16 (69.6) |
| Cerebral infarction | 11 (47.8) |
| TIA | 1 (4.3) |
| Amaurosis fugax | 4 (17.4) |
| Near total occlusion | 4 (17.4) |
| Level of stenosis | |
| C3 | 8 (34.8) |
| C4 | 15 (65.2) |
| Contralateral severe stenosis or occlusion | 7 (30.4) |
TIA: transient ischemic attack; Near total occlusion: the string sign on the computed tomography or cerebral angiography; C3: third cervical spine; C4: fourth cervical spine
