Locations of clinically significant steno-occlusive lesions detected on DSA
| Arteries and Segments | 50∼99% Stenosis | Complete Occlusion |
|---|---|---|
| Distal ICA | ||
| Supraclinoid | 5 | 2 |
| Petrocavernous | 6 | 5* |
| MCA | ||
| Horizontal (M1) | 9 | 6 |
| Bifurcation or M2 | 2 | 0 |
| VBA | ||
| Basilar trunk | 3 | 0 |
| Distal vertebral | 2 | 0 |
| Total (n = 40) | 27 | 13 |
Note:—DSA indicates digital subtraction angiography; ICA, internal carotid artery; MCA, middle cerebral artery; M2, vertical segment of MCA; VBA, vertebrobasilar artery.
* Complete occlusion of the petrocavernous portion of internal carotid artery by occlusion of the proximal bulb portion.