Angiographic characteristics of stenosis
| Characteristic | No. (%) |
|---|---|
| Right ICA stenosis | 100 (49.8) |
| Left ICA stenosis | 101 (50.2) |
| % Stenosis (treated vessel) | |
| <95% | 144 (71.6) |
| 95%–98% | 40 (20) |
| 99% | 17 (8.45) |
| % Contralateral stenosis | |
| <70% | 136 (67.5) |
| 70%–98% | 27 (13.4) |
| 99% | 4 (2) |
| 100% | 34 (17) |
| Ulcerated plaque | 102 (50.7) |
| Calcified plaque | 90 (45) |
| Functioning AcomA | 159 (79.1) |
| Functioning PcomA | 96 (45.7) |
| Plaque size (cm) | Mean, 1.79 cm (range, 0.1–2.4) |
| Distance from carotid bulb (cm) | Mean, 0.31 cm (range, 0–1.2) |
| Intracranial lesion* | 23 (13) |
| Dissection post-PTA† | 16 (8) |
| Transient asymptomatic vasospasm | 59 (29.4) |
Note:—PTA indicates percutaneous transluminal angioplasty; AcomA, anterior communicating artery; PcomA, posterior communicating artery; ICA, internal carotid artery.
* “Intracranial lesion” is defined as any aneurysm, stenosis, or vascular malformation discovered in the pre-CAS angiographic study.
† Dissection post-PTA indicates a subtle intimal irregularity shown in the angiographic post-PTA and pre-CAS examination, due to manipulation during PTA, with no clinical manifestation.