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This article includes supplementary video clips, available online at http://www.interscience.wiley.com/jpages/0885-3185/suppmat .

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mds21856.mpg13602KSegment 1. Two types of hyperkinetic movements were observed during the patient's stay in hospital (31 months after initial motor weakness). The first of these were choreic movements affecting the face and jaw, with blinking, grimaces, and fleeting rotary movements of the arms. The second were large rotatory excursions involving the axial and proximal appendicular musculature of the UL at shoulder level, meeting ballism criteria. She could not protrude her tongue fully for 10 seconds.

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