FIG 1. Images obtained in a 36-year-old woman with a right occipital AVM fed by braches of the left posterior cerebral artery. Volume-rendered 3D-DAs from a rotational acquisition in the left VA.

A, Lateral projection shows the small left occipital AVM (arrowheads) and its adjacent draining vein (squiggly arrow). A curve of the anterior-inferior cerebellar artery (AICA) in the internal auditory canal (white arrow) and a fenestrated posterior-inferior cerebellar PICA (gray arrow) with an extracranial loop are demonstrated within their surrounding osseous landmarks.

B, Posteroanterior projection shows the intracanalar segment (arrowheads) of the left AICA (arrow) to better advantage.