ABSTRACT
Delusional Disorder This group of disorders is characterised by the development of a single delusion or of a set of related delusions which persist. Although the delusions are highly variable in content, often being persecutory, hypochondriacal, or grandiose, they may be concerned with litigation or jealousy. Depressive symptoms may present intermittently and olfactory and tactile hallucinations may develop in some cases (although these are rare). The delusions must be present for at least 3 months for the diagnosis to be made after organic brain disease has been excluded. They are differentiated from schizophrenia due to the absence of delusions of passivity or thought control.
