FIG 3. Patient 4. A, Ninety-five percent right internal carotid artery stenosis.

B, Post angioplasty and stenting with no significant residual stenosis.

C and D, Angiogram immediately post stenting demonstrates extravasation from a lenticulostriate artery (arrow). At no time during the procedure did a catheter or guidewire enter into the intracranial circulation.

E, CT of head postoperatively shows a right basal ganglia, intraventricular, and subarachnoid hemorrhage as well as hydrocephalus.