FIG 1. A 66-year-old male patient presented with unstable angina. He had mild right hemiparesis due to a stroke 8 years before, and he had a 2-month history of transient left hemiparesis. His risk factors included diabetes mellitus and hypertension.

A, Lateral right common carotid arteriogram shows severe stenosis in the proximal cervical segment of the right internal carotid artery.

B, Anteroposterior view shows no significant stenosis in the intracranial vessels except for mild luminal irregularities.

C and D, Left common carotid arteriograms shows mild narrowing of the carotid bulb portion without significant stenosis in the intracranial vessels.