Dystonia

Abstract
Dystonia is a movement disorder characterized by sustained muscle contractions, repetitive twisting movements, and abnormal postures of the trunk, neck, face, or arms and legs. Dystonia is often confused with spasticity or rigidity and is even mistakenly attributed to psychogenic causes. This review covers recent advances in the causes and treatment of both primary and secondary dystonias, including those that are drug-induced, related to acquired brain lesions, or part of heredodegenerative syndromes.