mdc312016-sup-0001-VideoS1.mp4MPEG-4 video11940K

A video accompanying this article is available in the supporting information here.

Video. Case 1: Right shoulder semirhythmic tremor with anterior-posterior motion of humeral head; the movements are not distractible. Case 2: Bilateral semirhythmic anterior-posterior movement of the shoulder: distraction slightly reduced the amplitude of movement. Case 3: Semirhythmic shoulder movement on the left side predominantly in the scapular region.

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