Click on image to view larger version.
Fig 2. Left vertebral angiograms in anteroposterior (AP) (A) and lateral (B) views show the anterior spinal artery (ASA; arrow) filled in retrograde direction as well as the occluded VA in patient 3, though it is not clear that the ASA is providing any significant collateral support to the posterior circulation. Left common carotid angiograms in AP (C) and lateral (D) views reveal contrast filling of the basilar artery from the posterior communicating artery. Diffuse severe arteriosclerotic narrowing and dilation of cerebral arteries is also noted.
