Variant PTA Terminating in Cerebellar Artery, Associated with Multiple Aneurysms

Figure 2

(a) Three-dimensional digital subtraction angiography shows left posterior communicating artery aneurysm (arrow) and left persistent trigeminal artery (PTA) aneurysm (arrowhead). (b) Left internal carotid injection in the lateral projection demonstrates a PTA (arrow). Inset box is a magnified view (PTA aneurysm, arrowhead). (c) Left internal carotid injection in late arterial phase showing a PTA that supplies the anterior inferior cerebellar arteries (AICA) and inferior vermian (arrow) and hemispheric (arrowhead) branches of posterior inferior cerebellar arteries (PICA). (d) Right vertebral artery injection shows left AICA hypoplasia (arrow). (e) Left vertebral injection in the early capillary phase showing the relative lack of capillary staining in the left inferolateral cerebellar hemisphere. (f) Three-dimensional digital subtraction angiography shows right PICA (arrow) crossing midline and suppling left PICA territory (arrowhead). The left vertebral angiography in the anteroposterior (g) and lateral (h) projection shows left AICA hypoplasia and left posterior inferior cerebellar artery (PICA) aplasia.

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