4 CASES OF VERTEBROBASILAR INSUFFICIENCY

Four cases of vertebrobasilar insufficiency are reported. Case 1 was a 38-year-old man who felt a sudden onset of dizziness when he turned h is head to the back. An abnormal positional nystagmus was observed whe n he rotated his head to the left. A magnetic resonance angiogram (MRA ) demonstrated total occlusion of the left vertebral artery (VA). Case 2 was a 31-year-old woman who had a total occlusion of her left VA as observed in the MRA. Case 3 was a 68-year-old man who noted dizziness . The systolic blood pressure change on his Schellong test was 28 mmHg . On his MRA, severe displacement of the basilar and the vertebral art eries was visible. Case 4 was a 76-year-old woman who noted a blackout -like sensation. Optokinetic nystagmus was noted with a hyponystagmus pattern, and an eye tracking test showed a saccadic pattern. On her MR A, the vertebrobasilar system was narrowed. The arterial architecture and any stenosis of the blood vessels could be detected non-invasively by MRA.