dmcn12321-sup-0001-Video1.mp4MPEG-4 video4845KVideo S1: A video clip of the patient in Case 1 taken during her acute admission shows a unilateral right-sided hyperkinetic movement disorder, characterized by distal choreoathetoid right arm movements. In addition, there is dystonic dorsiflexion of the right foot and dystonic posturing of the right arm. No abnormality was seen on the left side. Of note, the patient is interacting normally and functioning well despite her movement disorder.
dmcn12321-sup-0002-Video2.mp4MPEG-4 video4612KVideo S2: A video clip of the patient in Case 1 at 3 months after immunotherapy, during an outpatient clinic appointment, demonstrating resolution of the movement disorder.
dmcn12321-sup-0003-Video3.mp4MPEG-4 video4569KVideo S3: A video of the patient in Case 3 demonstrates stereotyped repetitive abdominal myoclonus during a normal EEG recording. The movement disorder was not associated with an overwhelming urge or suppressibility. There is, however, suggestion of distractibility as the patient begins to speak. Overall, the clinical picture was felt to be consistent with an abdominal myoclonus of propriospinal origin.

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