title: Schizoaffective psychoses: genetical clues to classification.
abstract: The diagnostic classification of schizoaffective psychoses has varied much since Kasanin introduced the concept in 1933. The various classifications have agreed that schizoaffective psychoses present a combination of schizophreniform and affective symptoms, but the diagnostic criteria differ as to the number, quality, and time sequence of the symptoms even in recent classifications like RDC, DSM-III-R, and ICD-10. The classifications are syndromatical, and the etiology of the schizoaffective psychoses is still undetermined apart from evidence for a strong genetic factor. Results from family, twin, and adoption studies are divergent, but all the same, support a separate classification of broadly defined schizoaffective psychoses as possibly being phenotypical variations or expressions of genetic interforms between schizophrenia and affective psychoses.
mesh_terms: D001714:Bipolar Disorder / Q000235:genetics; D003718:Denmark; D004200:Diseases in Twins; D005190:Family; D005260:Female; D006801:Humans; D008297:Male; D011618:Psychotic Disorders / Q000145:classification* / Q000175:diagnosis / Q000235:genetics*; D012559:Schizophrenia / Q000235:genetics; D014481:United States