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Conference Report: The Torsion Dystonias: A summary of the Third Dystonia Workshop Vancouver, B.C. March 1980

The torsion dystonias, also called Dystonia Musculorum Deformans, comprise a group of neurological illnesses characterized by sustained, involuntary twisting movements affecting muscle groups in the limbs, trunk, neck or face. Three hereditary forms may be distinguished; an autosomal recessive form found mostly among the Ashkenazim, an autosomal dominant form, and a rare sex linked form found only on the Phillipine Islands. There are also secondary dystonic states associated with other diseases, toxins or trauma. Neither the biochemical nor the morphological pathology is known, but the abscence of pathological evidence of neuronal cell death and the successful treatment of some cases with drugs or surgery suggests that, when properly understood, the course of dystonia may be arrested.