Acute retinal necrosis classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.

Overview

Acute retinal necrosis may be classified both by staging - Acute or Late - or by severity: Mild or Fulminant.

Classification

• Acute retinal necrosis (ARN) may be classified by staging and severity into the following:
  • Acute stage: Occurs at onset of disease and usually progresses past acute classification after a few weeks.
    • Presents with coalescence of white, necrotic tissue in the peripheral retina.
    • Vaso-occlusive retinal vasculitis is usually present.
    • The optic nerve head of the affected eye will appear swollen, but the posterior pole will usually not be affected during the acute stage.
  • Late stage: Is the natural progression of the disease and will present differentiating characteristics after a few weeks up to a few months.
    • Characterized by a regression of the coalesced necrosis in the peripheral retina, presenting starkly contrasted necrotic/non-necrotic tissue and mild pigmentation scarring and increased vitreous debris
    • Retinal detachment, severe vision loss, and potential blindness in the affected eye is indicative of late stage ARN.
    • If the infection is bilateral, the second eye will usually present signs of ARN in the weeks and months following the initial symptom manifestation in the first eye.
• Acute retinal necrosis can also be classified by severity into the following:
  • Mild: Is used to characterize ARN that is stable and non-progressive.
    • There is usually no sign of retinal detachment.
  • Fulminant: ARN that is progressive and will usually lead to retinal detachment and further complications if untreated.