Dysarthria and dysphagia due to the opercular syndrome in multiple sclerosis.

We report a patient with relapsing-remitting multiple sclerosis (RRMS), who developed bilateral severe tongue weakness due to the anterior opercular syndrome. This was caused by a recent inflammatory demyelinating lesion in the right perisylvian juxtacortical region, superimposed on a pre-existing left perisylvian lesion, which had previously caused temporary isolated right tongue weakness.