title: Autoimmune-Mediated Psychosis: A Case of Susac Syndrome in a Drug User.
abstract: OBJECTIVE
  Susac syndrome, a rare disorder, is thought to be mediated by autoantibodies. One of the potential targets of these autoantibodies could be an antigen in the microvessels of the brain, the retina, and the inner ear leading to central nervous system (CNS) alterations, visual disturbances, and hearing deficits. Our aim is to expand clinicians' diagnostic options when facing psychosis due to medical conditions.
  
  
  METHODS
  A case report was conducted for this study.
  
  
  RESULTS
  This paper reports the case of a young male drug user who presented with psychosis, confusion and CNS vasculitis. First deemed to be drug-induced CNS vasculitis, it was finally diagnosed as Susac syndrome.
  
  
  CONCLUSIONS
  Although an infrequent entity, Susac syndrome should remain an option in the differential diagnosis of several neurological and psychiatric presentations.
authors.affiliation: a Addictive Behaviours Unit , Clinical Neuroscience Institute, Clinic Hospital of Barcelona , Barcelona , Spain.
authors.forename: Pablo
authors.initials: P
authors.lastname: Barrio
authors.affiliation: a Addictive Behaviours Unit , Clinical Neuroscience Institute, Clinic Hospital of Barcelona , Barcelona , Spain.
authors.forename: Mercè
authors.initials: M
authors.lastname: Balcells
authors.affiliation: b Neurology Department , Clinical Neuroscience Institute, Clinic Hospital of Barcelona , Barcelona , Spain.
authors.forename: Delón
authors.initials: D
authors.lastname: La Puma
authors.affiliation: b Neurology Department , Clinical Neuroscience Institute, Clinic Hospital of Barcelona , Barcelona , Spain.
authors.forename: Carles
authors.initials: C
authors.lastname: Gaig
mesh_terms: D001327:Autoimmune Diseases / Q000209:etiology*; D003937:Diagnosis, Differential; D017831:Diagnosis, Dual (Psychiatry); D004660:Encephalitis / Q000209:etiology; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000150:complications*; D011618:Psychotic Disorders / Q000209:etiology*; D055955:Susac Syndrome / Q000150:complications / Q000175:diagnosis*; D014657:Vasculitis / Q000209:etiology; D055815:Young Adult
keywords: CNS vasculitis; Susac syndrome; cannabis dependence; drug use