FIG 2. A, DSA of the left vertebral artery performed at 12 months after treatment of a 6-mm aneurysm of the left posterior inferior cerebellar artery. The frontal head view shows (arrow) an opacification of residual aneurysm (class 3).

B, Contrast-enhanced MR angiograph with MIP reconstruction in the frontal plane demonstrates (arrow) a residual aneurysm (class 3).