Persistent Trigeminal Artery Anomaly with Concomitant Basilar Artery Hypoplasia

The persistent Primitive Trigeminal Artery (PTA) is the largest of the fetal carotid-basilar anastomosis arteries. PTA is generally determined incidentally during investigations for unrelated reasons. Persistent trigeminal artery is a rarely seen anomaly with reported incidence of 0.1% - 0.5%.It may be seen together with one or several vascular variations of the head and neck region. In cases where surgery or a neuroradiological intervention is planned, it may be important to know about both PTA and other concomitant vascular variations. The radiological findings are here presented of persistent trigeminal artery anomaly accompanied by basilar artery hypoplasia.