[Generalized tic (Gilles de la Tourette's syndrome) in twins]

Two pairs of monozygotic twins with tic hyperkinesis are described. One pair manifested a clinical picture of generalized tic (Gilles de la Tourette's disease), the other generalized and local tic. These observations may point to an involvement of hereditary factors in the genesis of generalized tic and to the similarity of the pathogenetic mechanisms of local and generalized tics.