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

FilenameFormatSizeDescription
jws-mds.21014.mpg13735K The patient tells the interviewer how the abnormal movements began. Involuntary movements are shown with fixed posture (extended arms). Pseudoathetosis is also observed on the toes. Proprioception is tested and patient is unable to answer correctly to limb position. Segment 2. The patient mentions how his symptoms started. Pseudoathetosis is shown at rest and on posture maintenance. On neurological examination, patient cannot determine joint position on the affected side. Segment 3a. The patient explains she has multiple sclerosis and that she has recently developed involuntary movements in her hands. She says she has no control over her hands. Abnormal movements are recorded on posture and rest. Segment 3b. Same patient as in 3a, after an intravenous methylprednisolone course, reporting improvement of involuntary movements.

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