Hemibalplismus is regularly associated with lesions in the contralateral subthalamic nucleus. In addition, hemichorea, at times violent enough to be called hemiballismus, occurs occasionally as a result of lesions in other sites, including the pallidum, thalamus, cortex, and, most often, the neostriatum, usually on the side opposite the uncontrollable limbs. We describe a patient in whom two distinct episodes of severe left-sided hemichorea were associated with two separate right-sided cerebral lesions, one chiefly in the putamen, the second in the caudate nucleus.
Goldblatt D, Markesbery W, Reeves AG. Recurrent Hemichorea Following Striatal Lesions. Arch Neurol. 1974;31(1):51–54. doi:10.1001/archneur.1974.00490370077012
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