Angiographic data on ICA stenosis (DSA, n = 40 patients)
| ICA Segment | Extracranial | C5 | C4 | C3 | C2 | C1 | Total Intracranial (n = 400) |
|---|---|---|---|---|---|---|---|
| Normal | 27 | 58 | 48 | 60 | 48 | 59 | 273 |
| <50% | 26 | 16 | 21 | 11 | 13 | 5 | 66 |
| >50% | 23 | 1 | 6 | 4 | 11 | 8 | 30 |
| <30% | 18 | 10 | 17 | 8 | 10 | 4 | 49 |
| 30%–49% | 8 | 6 | 4 | 3 | 3 | 1 | 17 |
| 50%–69% | 10 | 1 | 4 | 2 | 5 | 1 | 13 |
| 70%–89% | 4 | 0 | 1 | 1 | 2 | 4 | 8 |
| 90%–99% | 9 | 0 | 1 | 1 | 4 | 3 | 9 |
| Occlusion | 1 | 0 | 0 | 0 | 4 | 4 | 8 |
| Not assessable | 3 | 5 | 5 | 5 | 4 | 4 | 23 |
| Total | 80 | 80 | 80 | 80 | 80 | 80 | 400 |