Comorbidity of certain obsessive-compulsive spectrum disorders (OCSDs; such as Tourette's disorder) in obsessive-compulsive disorder (OCD) may serve to define important OCD subtypes characterized by differing phenomenology and neurobiological mechanisms. Comorbidity of the putative OCSDs in OCD has, however, not often been systematically investigated.
MRC Unit on Anxiety and Stress Disorders, Department of Psychiatry, University of Stellenbosch, PO Box 19063, Tygerberg, 7505, Cape Town, South Africa. cl2@sun.ac.za
