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The incidence of obsessive-compulsive disorder (OCD) in patients with Gilles de la Tourette's syndrome (GTS) was assessed with a specially designed questionnaire. The Inventory was administered to patients with OCD, patients with GTS, and normal controls. Fifty-one percent of the patients with GTS had significantly elevated Inventory scores. The frequent occurrence of OCD in GTS suggests that the two disorders may share common neurobiologic mechanisms.
Frankel et al. (Sat,) studied this question.