title: Diurnal variation in Cotard's syndrome (copresent with Capgras delusion) following traumatic brain injury.
abstract: OBJECTIVE
  The aim of this paper is to document regular nocturnal intensification of delusional nihilistic and persecutory ideas (Cotard delusion) linked with extreme depersonalisation and hypervivid dreaming.
  
  
  METHODS
  A 17-year-old man presented with Cotard and Capgras delusions after sustaining multiple cognitive impairments secondary to traumatic brain injury.
  
  
  RESULTS
  Delusional ideation fully resolved within 14 days of commencement of olanzapine 5 mg daily.
  
  
  CONCLUSIONS
  This patient's experience of perceptual abnormalities and impairments in meta-abilities related to self-monitoring and critical inferencing lends support to multicomponent sensory processing accounts of brain injury related, content-specific delusional syndromes.
authors.affiliation: Royal Rehabilitation Centre, Ryde, New South Wales, Australia. butlerp@doh.health.nsw.gov.au
authors.forename: P V
authors.initials: PV
authors.lastname: Butler
mesh_terms: D000293:Adolescent; D014150:Antipsychotic Agents / Q000008:administration & dosage / Q000627:therapeutic use; D001569:Benzodiazepines; D001930:Brain Injuries / Q000150:complications*; D002194:Capgras Syndrome / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology*; D002940:Circadian Rhythm / Q000502:physiology*; D003702:Delusions / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology* / Q000523:psychology*; D006801:Humans; D008297:Male; D000077152:Olanzapine; D010468:Perceptual Disorders / Q000209:etiology; D010890:Pirenzepine / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000627:therapeutic use; D013577:Syndrome
chemical_list: D014150:Antipsychotic Agents; D001569:Benzodiazepines; D010890:Pirenzepine; D000077152:Olanzapine