FIG 5. Disagreement between MRA and DSA on the occlusion status of a posterior inferior cerebellar artery aneurysm 14 months after treatment with coils.

A, DSA image obtained immediately after coiling shows a small area of residual filling (arrow).

B, Nonenhanced MOTSA 3D TOF MRA image obtained 14 months after treatment shows flow in the aneurysm neck (arrow), which was interpreted as a 2-mm remnant by both observers.

C, DSA image shows filling of the aneurysm neck (arrow), which was interpreted as a 2-mm recurrence (including a 1-mm remnant) due to coil compaction. Both observers thought that additional treatment for this small recurrence was not indicated.