title: Acute zonal occult outer retinopathy: a case report.
abstract: BACKGROUND
  Acute zonal occult outer retinopathy (AZOOR) is a disorder of unknown etiology with a predilection for young women. AZOOR is characterized by an acute loss of one or more zones of outer retinal function with a corresponding loss of visual field in one or both eyes. Patients present with photopsia, variable funduscopic changes, and abnormal electroretinogram (ERG) findings. There are no proven treatments. Diagnosed cases have a reasonable prognosis because central vision is often spared.
  
  
  METHODS
  A 24-year-old white woman presented with acute photopsia with clouded temporal vision in the right eye (O.D.). Initial evaluation found a slightly swollen nerve fiber layer with no other outstanding lesions O.D. Over a 7-week follow-up period, there was significant progression into the deep chorioretinal tissues O.D. with an anterior chamber response. At 3 months, an afferent pupillary defect (APD) developed with significant retinal pigment epithelium (RPE) changes. After extensive testing, the consulting retinal specialist identified AZOOR as the etiology. At 21 and 31 months, the process remained in remission. Although primary symptoms subsided, the dense inferior-temporal field defect remained O.D.
  
  
  CONCLUSIONS
  AZOOR is a rare condition with subtle and often vague signs and symptoms making diagnosis difficult. The course of AZOOR, its clinical presentations, hypothesis of etiology, differential diagnosis, workup, management, and prognosis are reviewed.
authors.affiliation: The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA. jibiron1@jhmi.edu
authors.forename: Josephine O
authors.initials: JO
authors.lastname: Ibironke
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Gurwood
mesh_terms: D000208:Acute Disease; D003937:Diagnosis, Differential; D004596:Electroretinography; D005260:Female; D005451:Fluorescein Angiography; D005500:Follow-Up Studies; D005654:Fundus Oculi; D006801:Humans; D012164:Retinal Diseases / Q000175:diagnosis* / Q000503:physiopathology; D055213:Retinal Pigment Epithelium / Q000473:pathology*; D013997:Time Factors; D014792:Visual Acuity; D055815:Young Adult