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Fig. 3A —Catheter angiogram depiction of collateral circulation beyond site of arterial occlusion in 70-year-old woman. Catheter angiogram, anteroposterior projection, early arterial phase of left internal carotid artery injection, shows stenosis of left middle cerebral artery (arrowhead) with absence of opacification of suprasylvian branches (arrow). Note incidental finding of opacification of both posterior cerebral arteries and basilar artery via flow through left posterior communicating artery.