Dystonia in spinocerebellar ataxia type 6.

Spinocerebellar ataxias are heterogeneous disorders with overlapping clinical features. Spinocerebellar ataxia-6 is a dominantly inherited condition characterized by relatively pure ataxia with a paucity of other manifestations including extrapyramidal findings. We report on two patients with genetically proven SCA-6 who had dystonia. One patient presented initially with dystonia, which remained the most disabling problem. Dystonia may occur in SCA-6 and can be disabling.