Bilateral chorea–ballism associated with hyperthyroidism


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We describe a 50-year-old patient with four episodes of recurrent bilateral chorea–ballism (BCB) and associated hyperthyroidism. Reappearance of BCB, associated with increased serum levels of thyroid hormones and lack of relevant changes on brain computed tomography/magnetic resonance imaging scans, suggested that the involuntary movements were likely due to thyrotoxicosis-induced biochemical changes. © 2004 Movement Disorder Society