Cerebellar decompensation following a stroke in contralateral posterior parietal cortex.

We describe here a patient who exhibited cerebellar hypermetria on the left side following a cerebellar ischemia in left cerebellar hemisphere. She subsequently recovered clinically. However, twenty months after cerebellar ischemia, cerebellar symptoms reappeared suddenly. Moreover, kinematic and electromyographic (EMG) abnormalities during fast movements of left wrist were identical to those detected after the initial cerebellar lesion. Surprisingly, the causal lesion of this cerebellar decompensation was found to be a stroke at the level of the right posterior parietal association area.