Mutism resulting from heterochronic bilateral cerebellar hemorrhages - A case report.

Cerebellar mutism (CM) is a neurological condition characterized by lack of speech due to cerebellar lesions. Interruption of the bilateral dentatothalamocortical (DTC) pathways at midline structure seems the principal cause of CM but not fully understood. We described a rare case of CM due to heterochronic bilateral cerebellar hemorrhages.An 87-year-old woman presented with depression of alertness after sudden vomiting. Neurologically, mild dysmetria and mutism were observed. The head computed tomography (CT) showed both a fresh right cerebellar hemorrhage and an obsolete left one. The patient was diagnosed as CM since both the thalamus and the supplementary motor area were bilaterally intact on both CT and magnetic resonance imaging. Medical treatment and rehabilitation improved her ataxia and ambulation. She became cognitively alert and could communicate by nodding, shaking her head, or facial expression. However, her mutism did not change at 4 months after the stroke.There are few reports on CM due to direct injuries to the bilateral dentate nuclei. Since our case did not show any injury other than bilateral dentate nuclei, this report can support the hypothesis that the interruptions of the bilateral DTC are the cause of CM.