Delusional misidentification syndromes

Abstract

Delusional Misidentification Syndrome (DMS) is a rare psychopathological phenomenon, seen in <1% of psychiatric patients. There are various types of DMS, but broadly: they are of self, other people or beings, inanimate objects, or places. Although occurring in both psychiatric and neurologic illnesses, the former is more common. In this case series, eleven patients suffering from psychotic illnesses, having six different types of DMS are reported. In each case, the DMS grants uniqueness to both the presentation and course of illness. As evidenced by prior studies, the majority of cases are of Paranoid Schizophrenia, and the most common DMS is Capgras delusion, seen in 0.12% of the general population. The common occurrence of aggression and hostility in DMS has been well explored. Remission occurred with the treatment of the underlying illness. The lacunae in formal guidelines to ascertain and treat DMS, and its correlation with forensic psychiatry mandates further research.