Figure 1From: Circle of Willis variation in a complex stroke presentation: a case report3D-CTA image of the circle of Willis. The A1 segment of the left anterior cerebral artery is absent (open arrow). The ICA on the right (large solid arrow) is feeding both anterior cerebral arteries (small solid arrows) and the ipsilateral middle cerebral artery. In addition there is an anterior communicating artery aneurysm.Back to article page