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Primary writing tremor: Report of a case successfully treated with botulinum toxin A injections and discussion of underlying mechanism



Primary writing tremor (PWT) is a rare motor disorder of unknown etiology, where tremor is elicited primarily or exclusively with writing. We describe a patient with PWT, present a video before and after successful treatment with botulinum toxin type A injections, and discuss a possible underlying dystonic mechanism. © 2005 Movement Disorder Society