Figure 6

Angiogram demonstrating posterior circulation and moyamoya vessels; a sagittal view in which the basilar artery (arrow A) is seen filling the middle cerebral artery (arrow B). This is occurring due to the occlusion of the internal carotid arteries. Also shown are the moyamoya vessels (arrow C) in a 'puff of smoke' formation (see 'discussion'). These vessels have developed secondary to occlusion in and around the circle of Willis.