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The incoordinated uncontrollable movements, as seen in Sydenham's chorea, athetosis and torsion spasms, or rigid states, as seen in parkinsonian conditions, have long been familiar to the medical profession but poorly interpreted. Some conditions, as torsion spasm and pseudosclerosis, used to be considered functional. Within the last two decades, especially after the appearance of the multitude of cases of postencephalitic states, many of the foregoing morbid conditions came to be understood as lesions of some subcortical centers of the brain, mainly of the corpus striatum, globus pallidus and substantia nigra. It is but natural that the unsettled state of a comparatively novel subject, its difficulty, gave rise to a variety of opinions. This led to an overproduction of contributions which unfortunately were not only numerous but often voluminous and rather confusing. For this reason the booklet by Van Gehuchten is opportune, for it gives a concise review of the clinical,
La pathologie du système pallido-strié.. JAMA. 1931;96(14):1172. doi:10.1001/jama.1931.02720400070036