A “true fetal posterior cerebral artery” is an extremely rare anatomic variant of the cerebral vasculature in which 2 independent posterior cerebral arteries are present; 1 arises from a persistent large primitive anterior choroidal artery and a second arises in the usual
fashion. This case report demonstrates this diagnosis made using cerebral angiography in a young woman with nonspecific headaches whose MR imaging brain scan was originally interpreted as a brain arteriovenous malformation or dural arteriovenous fistula. Given the rarity of a true fetal posterior
cerebral artery, awareness of this entity may make it discernible on cross-sectional imaging. In addition, it is important to be able to recognize this angiographically because this variant supplies posterior cerebral structures and should not be embolized.
Anomalous Origin of the Anterior Choroidal Artery Proximal to an Ipsilateral Fetal Posterior Cerebral Artery: Case Report of an Extremely Rare Anatomic Variant and Discussion of its Clinical Implications
