RT Journal Article SR Electronic T1 Rare anatomical variations of persistent trigeminal artery in two patients with non-aneurysmal subarachnoid hemorrhage JF Journal of NeuroInterventional Surgery JO J NeuroIntervent Surg FD BMJ Publishing Group Ltd. SP 282 OP 284 DO 10.1136/jnis.2010.003665 VO 3 IS 3 A1 Samaniego, Edgar A A1 Dabus, Guilherme A1 Andreone, Vincenzo A1 Linfante, Italo YR 2011 UL http://jnis.bmj.com/content/3/3/282.abstract AB Carotid–basilar anastomoses are remnants of the fetal circulation and although rare, they may become symptomatic and should be recognized during cerebral angiography. Two patients are described with non-aneurysmal subarachnoid hemorrhage and persistent trigeminal arteries (PTA) found on cerebral angiography. In the first patient, the PTA ended in the anterior inferior cerebellar artery (AICA) and posterior inferior cerebellar artery. The second patient had a PTA terminating in the AICA and superior cerebellar artery. These rare anatomical PTA variants should be recognized on cerebral angiography.