The position of delusional parasitosis in psychiatric nosology and classification.

Discussions on the nosological position of delusional parasitosis (DP) have resulted in a wide range of opinions. In the present study in 34 patients with DP, the various and contradictory opinions concerning DP positioning in psychiatric nosology were examined through clinical, psychopathological, and polydiagnostic analyses using VRC, DSM-III, DSM-III-R and ICD-9. The psychopathological analyses with VRC as well as the polydiagnostic comparisons with other classification systems indicated that DP is neither a nosological entity nor due to a specific psychiatric illness. As our results showed, DP is a nosologically unspecific syndrome, which may occur superimposed on all psychiatric disorders.