Functional dystonia or spasms

**Definition:** Functional movement disorder presenting predominantly with mobile or fixed dystonic posturing which is incongruous with other causes of dystonia and may be responsive to placebo therapy or psychotherapy. Typically a clenched fist, inverted ankle or orbicularis oculis/platysma contraction with onset as a teenager or adult.

Functional dystonia or spasms where no cause has been identified after investigation.