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Background: The Acute Retinal Necrosis (ARN) is an inflammatory, rapidly progressive necrotizing retinitis and vasculitis, most frequently caused by Varicella-Zoster-Virus (VZV), followed by Herpes-Simplex-Virus (HSV), Cytomegalovirus (CMV) and Epstein-Barr-Virus (EBV). The diagnosis is based on clinical signs that were first defined by the American Uveitis Society in 1994 that include one or more foci of retinal necrosis, rapid progression without treatment, circumferential progression, occlusive vasculopathy, and inflammatory signs of the vitreous and anterior chamber Methods: In this retrospective analysis, we included 16 eyes of 10 patients, six patients with simultaneous or delayed bilateral affection, treated for ARN. Status of disease, corrected distance visual acuity (CDVA, decimal), intraocular pressure (IOP), pathogen proof, therapy, and complications were evaluated at diagnosis and 3 months later. Results: In nine patients, the pathogen was identified (six VZV, two HSV, one CMV, one EBV). All patients were treated with systemic and intravitreal virustatic agents. In nine eyes with a CDVA of 0.2 ± 0.2 at hospital admission, vitrectomy was performed, and in seven eyes with CDVA of 0.5 ± 0.3, no vitrectomy was performed (p = 0.04). After 3 months, CDVA of the vitrectomized eyes decreased to 0.1 ± 0.1 vs. 0.4 ± 0.3 (p = 0.01) without vitrectomy. CDVA of fellow eyes affected was 0.6 ± 0.2 at initial presentation vs. 0.2 ± 0.2 for eyes affected first and 0.4 ± 0.3 vs. 0.1 ± 0.1 after 3 months. We observed several complications including retinal detachment, recurrence of the disease, and bulbar hypotony. Conclusion: For fellows eyes affected, diagnosis could be confirmed earlier, leading to a more successful treatment. The success of vitrectomy is difficult to evaluate because vitrectomy is most frequently performed just in the advanced stages of the disease. Early treatment with an appropriate approach is essential to avoid loss of vision.

Acute Retinal Necrosis: Signs, Treatment, Complications and Outcome