Figure 1b. Ruptured 8-mm anterior communicating artery aneurysm in a 43-year-old woman treated with GDC placement. The initial anatomic result was total occlusion, and 3 months after treatment, DSA was normal. One year later, MR angiography and DSA were performed. (a) Maximum intensity projection (MIP) reconstruction of MR angiogram (three-dimensional time-of-flight spoiled gradient-echo sequence, 26.0/2.4 msec) shows at the right A1 segment to A2 segment junction a vascular abnormality (arrow), which was interpreted as an arterial loop, but (b) frontal and (c) oblique DSA views of the right internal carotid artery show the corresponding region to be an aneurysm remnant (arrow).