MeSH

Disorders in which there is a loss of ego boundaries or a gross impairment in reality testing with delusions or prominent hallucinations. (From DSM-IV, 1994)

Year introduced: 1981

Marked disorders of thought (delusions, hallucinations, or other thought disorder accompanied by disordered affect or behavior), and deterioration from a previous level of functioning. Individuals have one o more of the following symptoms: delusions, hallucinations, and disorganized speech. (from DSM-5)

Year introduced: 2015(1998)

A condition in which closely related persons, usually in the same family, share the same delusions.

Year introduced: 1981