Bilateral ballism developed gradually in a 75-year-old woman after head trauma. Computerized tomography revealed bilateral hemorrhagic infarction in the head of the caudate nucleus and the putamen. Haloperidol abolished the symptoms completely within 2 days. After 18 days, haloperidol was gradually withdrawal over 16 days. The patient remained without ballistic movements thereafter.
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Lodder et al. (1981) studied this question.