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Fig 1. Left vertebral angiograms in anteroposterior (A and C) and lateral (B and D) views show the occluded vertebral artery (VA) and retrograde upward flow through the anterior spinal artery (ASA) at early arterial (A and B) and later (C and D) phases in patient 1. The ASA is connected to the right distal VA and supplies the right anterior and posterior inferior cerebellar arteries.
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