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In a previous article, (1) we considered the two most common movement disorders in children: tics and stereotypies. Although less common, chorea, dystonia, myoclonus, and tremor are not rare in children. Therefore, it is important for the pediatric clinician to be able to recognize and distinguish these movement disorders. The first step in diagnosis and treatment is to identify and classify the disorders. In this article, we review these and drug-induced movement disorders. Drug-induced movement disorders fall into the same phenomenologic categories (chorea, dystonia, myoclonus, and tremor) but often are considered as a separate entity because of their specific causes and treatments.

Chorea is characterized by frequent, brief, unpredictable, purposeless movements that tend to flow from body part to body part chaotically and unpredictably. The movements are less sustained than those of dystonia but are more sustained and less...

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