The use of CT angiography is described in three patients for the evalu
ation of intracranial clips after surgery for an aneurysm, A postproce
ssing technique is described in which shaded-surface-display models we
re superimposed on maximum intensity projection CT angiograms, CT angi
ograms showed residual aneurysmal filling adjacent to a clip, patency
of a vessel thought to be compromised by recent clip placement, and er
rant position of a clip, which required repeat surgery.