Variations of Persistent Trigeminal Artery Terminating in the Anterior Inferior Cerebellar Artery: A Case Report

Persistent trigeminal artery (PTA) is a rare condition that represents a remnant fetal anastomosis between the carotid artery and basilar artery. PTA typically arises from precavernous portion of the internal carotid artery (ICA) to the basilar artery. Variations of PTA extending from the ICA and directly terminating as cerebellar arteries without jointing basilar artery are particularly rare. We presented the extremely rare case of the variations of PTA, which directly terminate in the ipsilateral anterior inferior cerebellar artery. In addition, we reviewed the embryogenesis and clinical implication of this anomaly.