Focal dystonia is a neurological condition affecting a muscle or muscles in a part of the body causing an undesirable muscular contraction or twisting. For example, in focal hand dystonia, the fingers either curl into the palm or extend outward without control.

Dystonia, idiopathic torsion: A form of dystonia known as early-onset torsion dystonia (also called generalized torsion dystonia) begins in childhood around the age of 12. Symptoms typically start in one part of the body, usually in an arm or leg, and eventually spread to the rest of the body within about 5 years. Early-onset torsion dystonia is not fatal, but it can be severely debilitating.


National Institute of Neurological Disorders and Stroke. (2007). Dystonias Fact Sheet. Retrieved October 31, 2007. http://www.ninds.nih.gov/disorders/dystonias/detail_dystonias.htm.

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