<unk> , also known as depressive psychosis, is a major depressive episode that is accompanied by<unk>  symptoms. It can occur in the context of bipolar disorder or major depressive disorder. It can be difficult to distinguish from schizoaffective disorder, a diagnosis that requires the presence of<unk>  symptoms for at least two weeks without any mood symptoms present. Unipolar<unk>  requires that the<unk>  features occur only during episodes of major depression. Diagnosis using the DSM-5 involves meeting the criteria for a major depressive episode, along with the criteria for "mood-congruent or mood-incongruent<unk>  features" specifier.
Psychotic depression
Depression 
Double depression
Collective depression
Retarded depression
Late life depression
Masked depression
Melancholic depression