Figure 3.

A) Composite overlapped digital subtraction angiograms of both right and left internal carotid arteries demonstrate low terminal carotid artery bifurcations, absent supraoptic A1 segments and an associated anterior communicating artery aneurysm. B) Surface rendered 3D angiographic reconstructions of the internal carotid arteries show that the ophthalmic artery origin is distal to the origin of the anomalous A1 segment (arrows). The anterior communicating artery aneurysm fills during the left carotid angiogram.