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jws-mds.20878.mpg13230K Segment 1. Before treatment: The patient displays a rapid jaw tremor only abolished when widely opening her mouth or clenching her teeth. Multiple distraction maneuvers did not alter the presence or frequency of the tremor. Electromyography showed a rhythmic 14-Hz contraction of the masseter muscles, resulting in a helicopter-like sound. Segment 2. After treatment: 2 months after botulinum toxin injection, the tremor was abolished clinically and electromyographically.

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