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Degree of stenosis of carotid artery and vertebral artery.
| CCA (n = 86) | ICA (n = 131) | VA (n = 4) | ||||
|---|---|---|---|---|---|---|
|
Symptomatic (n = 15) |
Asymptomatic (n = 71) |
Symptomatic (n = 39) |
Asymptomatic (n = 92) |
Symptomatic (n = 3) |
Asymptomatic (n = 1) |
|
| Absent/mild (0–30%, n = 195) | 11 | 67 | 29 | 85 | 2 | 1 |
| Moderate (31–69%, n = 8) | 1 | 1 | 4 | 2 | 0 | 0 |
| Severe (70–99%, n = 9) | 2 | 0 | 5 | 1 | 1 | 0 |
| Occlusion (100%, n = 8) | 1 | 3 | 1 | 4 | 0 | 0 |
CCA, common carotid artery; ICA, extracranial internal carotid artery; VA, vertebral artery.
