The occurrence in adults of abnormal involuntary movements of the limbs on one side has been recorded for a long time. Some of the movements have been like those encountered in the choreas of children and have been called "hemichorea." Others have been ceaseless and violent, have involved the bigger limb joints, and have produced wider movements. These have been called "hemiballism." There has been a tendency to think of the adult hemichoreas and hemiballism as manifestions of the same process, the latter possibly being considered only a severer manifestation of the former.1 Other workers are chary of such a similarity and prefer to think of hemichorea and hemiballism as separate disorders, with probably different etiologies and dissimilar locales of the causative lesions.2
Most observers have concurred in the idea expressed by Whittier3: "Hemiballism is the apparently inevitable symptom in man of destruction localized in the
SCHWARZ GA, BARROWS LJ. Hemiballism Without Involvement of Luys' Body. AMA Arch Neurol. 1960;2(4):420–434. doi:10.1001/archneur.1960.03840100058009
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