Fig. 3
From: Persistent trigeminal artery in a patient with moyamoya disease:a case report and literature review
Weon subtyped the PTA into five types based on its hemodynamic characteristics: type 1, the PTA supplies bilateral PCA, and superior cerebellar artery; type 2, the PTA supplies of the bilateral superior cerebellar artery; type 3, the PTA supplies the contralateral PCA; type 4, the PTA supplies ipsilateral PCA; and type 5 can be subclassified as 5a,5b, and 5c according to the terminative artery, the superior cerebellar artery (5a), anterior inferior cerebellar artery (5b), and the posterior inferior cerebellar artery (5c), respectively. PTA: persistent trigeminal artery; ICA: internal carotid artery; SCA: superior cerebellar arteries; AICA: anterior inferior cerebellar artery; PICA: posterior inferior cerebellar artery; BA: basilar artery; VA: vertebral artery; PCA: posterior cerebral artery