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Table 2: Angiographic characteristics of the patients
No Right VA Left VA Course of ASA Perfusion via ASA Collateral Supply from PcomA VBJ Patency Comment
1 Occlusion Occlusion L VA → R VA R AICA & PICA Both SCAs filling from L PcomA Yes Reversed flow of ASA disappeared after recanalization; reappearance of ASA
2 Occlusion Severe stenosis R VA → L VA Part of BA Nil Yes BA filling from L VA; reversal of ASA flow direction after recanalization
3 Occlusion Occlusion L VA → R VA Not profuse BA trunk filling from L PcomA No 
4 Severe stenosis Occlusion R & L VA → L VA Not profuse Both SCAs filling from R PcomA Yes Reversal of ASA flow direction after recanalization
5 Occlusion Occlusion R VA → both VAs R AICA & PICA; L AICA Nil Yes Increased perfusion through ASA after occlusion of L VA
6 Occlusion Severe stenosis R VA → R VA Not profuse Nil Yes Reversal of ASA flow direction after recanalization
Note:—VA, vertebral artery; ASA, anterior spinal artery; PcomA, posterior communicating artery; VBJ, vertebrobasilar junction; L, left; R, right; AICA, anterior inferior cerebellar artery; PICA, posterior inferior cerebellar artery; SCA, superior cerebellar artery; BA, basilar artery.