Extreme task specificity in writer's cramp.

BACKGROUND

Focal hand dystonia may be task specific, as is the case with writer's cramp. In early stages, task specificity can be so specific that it may be mistaken for a psychogenic movement disorder.

METHODS

We describe 4 patients who showed extreme task specificity in writer's cramp. They initially only had problems writing either a single letter or number. Although they were largely thought to be psychogenic, they progressed to typical writer's cramp.

CONCLUSIONS

Early recognition of this condition may provide an opportunity for early initiation of treatment.