Table 1:

Locations of clinically significant steno-occlusive lesions detected on DSA

Arteries and Segments50∼99% StenosisComplete Occlusion
Distal ICA
    Horizontal (M1)96
    Bifurcation or M220
    Basilar trunk30
    Distal vertebral20
Total (n = 40)2713
  • 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.