Fig. 1.

Patient 1. Left internal carotid angiograms, anteroposterior view (A) and lateral view (B), showing the persistent trigeminal artery variant (arrow) anastomosing the cavernous portion of the internal carotid artery to the anterior inferior cerebellar artery. Axial three-dimensional time-of-flight magnetic resonance source image (C) showing an abnormal vessel originating from the cavernous portion of the left internal carotid artery. Three-dimensional time-of-flight magnetic resonance angiography (D) showing a persistent trigeminal artery variant originating from the cavernous portion of the left internal carotid artery.