<prompt> The most common cause of anterior vermis syndrome is ___.Alcohol abuseAn abscessA tumorLead intoxication  <response>: Anterior vermis syndrome is a result of chronic alcohol abuse. Patients have dystaxia of the lower limb and trunk. Posterior vermis syndrome involves the flocculonodular lobe; it is most frequently caused by an ependymoma or a medulloblastoma. Patients have truncal dystaxia. Hemispheric syndrome usually is the result of a tumor astrocytoma or abscess; patients have arm, leg, trunk, and gait dystaxia. 