Figure 3.

Three-dimensional computed tomographic (CT) angiography showing a lateral petrosal variant of persistent trigeminal artery (PTA) as it exits immediately superior to the cranial end of petroclival fissure; just medial to Meckel's cave and closely related with the ophthalmic branch of trigeminal nerve. It courses posterior and medially to reach the basilar artery before its bifurcation. It relationships with posterior communicating artery (PcomA) and anterior choroidal artery (AchoA) are also showed