Fig. 4
From: Persistent trigeminal artery in a patient with moyamoya disease:a case report and literature review
The figure illustrates the role of PTA in patient with MMD. Under normal blood flow, the ICA supplies blood to the BA via PTA (A). However, in patients with MMD, the ICA get stenosis (B) and even occlusion (C), resulting in the flow of blood from BA to ICA via PTA partially (B) and totally (C). PTA: persistent trigeminal artery; MMD: moyamoya disease; ICA: internal carotid artery; BA: basilar artery