Angiography findings
| Findings | No. (%) |
|---|---|
| Left ICA NO | 60 (51.7) |
| Right ICA NO | 56 (48.3) |
| String sign | 34 (29.3) |
| Decreased diameter of the ipsilateral ICA | 82 (70.7) |
| Delayed arrival of contrast | 116 (100) |
| Ulceration | 58 (50) |
| Calcification | 69 (59.6) |
| Intracranial lesion | 12 (10.3) |
| Contralateral stenosis (%) | |
| 70–99 | 27 (23.3) |
| 100 | 8 (6.9) |
| Collateral pathways | |
| Patent AcomA | 103 (88.8) |
| Patent PcomA | 64 (55.2) |
| Ophthalmic artery | 44 (37.9) |
| Leptomeningeal artery | 29 (25) |
| Residual stenosis | |
| 0% | 95 (81.9) |
| 1–30% | 14 (12.1) |
| 31–50% | 5 (4.3) |
| 51–70% | 2 (1.7) |