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Table 1: 
Locations of clinically significant steno-occlusive lesions detected on DSA
Arteries and Segments50∼99% StenosisComplete Occlusion
Distal ICA
    Supraclinoid52
    Petrocavernous65*
MCA
    Horizontal (M1)96
    Bifurcation or M220
VBA
    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.