[Diagnosis and differential diagnostic features of gender identity disorder]

Gender identity disorder, or transsexualism as it is more commonly known, is a highly complex clinical entity. It is an identifiable and incapacitating disease which can be diagnosed and successfully treated by reassignment surgery. The diagnosis of gender identity disorder can be a difficult process. Transsexual patients will have to undergo extensive psychiatric assessment. The authors review the development of nosology of transsexualism. The current classification systems, symptoms and diagnostic features of gender identity disorders are discussed. The article also discusses differential diagnostic features, like intersex states, psychosis, transvestitism, autogynephilia, gynandromorphophilia, and self-amputation. The authors also discuss the problem of comorbidity, as well.