Abstract
Acute cerebellar vermis syndrome was discrived by Kornhuber in 1968 and Sakata in 1971: severe vertiginous attacks evoked in the supine position with the head hanging down during the positional nystagmus test, vertical positioning nystagmus to the lower eyelids, periodic alternative directional changing nystagmus, and no associated cerebellar symptoms in the limbs. It is not with lesions of the otolith.
Recently, we have some times seen patients with the acute cerebellar vermis syndrome who we first thought had infarction or bleeding in the cerebellar vermis. However, radiological studies showed no cerebellar findings indicating either infarction or bleeding. There was only cerebellar, especially vermis, atrophy.
This study of 122 patients shows that the acute cerebellar vermis syndrome is probably caused by cerebellar atrophy. We conclude that cerebellar atrophy, especially of the vermis, is probably the cause of the acute cerebellar vermis syndrome.
