title: Comorbidity of delusional disorder with bipolar disorder: report of four cases.
abstract: BACKGROUND
  Although it is accepted that patients with delusional disorder can show co-existing depression, comorbidity with bipolar disorder is not a recognised feature.
  
  
  METHODS
  Case report of patients who showed both delusional disorder and mania or hypomania. The patients were examined using lifetime structured psychiatric interview where possible.
  
  
  RESULTS
  Four patients are described who met criteria for delusional disorder, with durations ranging from 2 to 15 years, and also experienced one or more episodes of mania or hypomania.
  
  
  CONCLUSIONS
  Case reports cannot quantify a clinical association.
  
  
  CONCLUSIONS
  These cases suggest that there is an association between delusional disorder and affective disorder which goes beyond the occurrence of depressive symptoms in the disorder.
authors.affiliation: Benito Menni Complex Assistencial en Salut Mental, Barcelona, Spain. victorvicens@gmail.com
authors.forename: V
authors.initials: V
authors.lastname: Vicens
authors.forename: S
authors.initials: S
authors.lastname: Sarró
authors.forename: P J
authors.initials: PJ
authors.lastname: McKenna
mesh_terms: D000328:Adult; D001714:Bipolar Disorder / Q000150:complications* / Q000523:psychology; D015897:Comorbidity; D003527:Cyclothymic Disorder / Q000453:epidemiology / Q000523:psychology; D003863:Depression; D003866:Depressive Disorder / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D019964:Mood Disorders / Q000453:epidemiology; D012563:Schizophrenia, Paranoid / Q000150:complications* / Q000523:psychology