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Summary Two cases of severe thyrotoxicosis are described. They both exhibited choreo-athetoid movements which were abolished by successful treatment of the thyrotoxicosis. It is suggested that the tremor of mild thyrotoxicosis is one end of a spectrum at which choreo-athetosis is at the most severe end. A tentative explanation of this hypothesis is given in the discussion.
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Marks et al. (1979) studied this question.
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