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+A 34-year-old male patient diagnosed with chickenpox three weeks previously, which had resolved without complications. He came to the emergency department with a decrease in visual acuity in his left eye.
+Ophthalmological examination showed a corrected visual acuity of 1 in the right eye (OD) and 0.6 in the left eye (OI). The slit-lamp study showed a cellular tyndall of 4+ in the OI, keratic precipitates (3+) and no fluorescein staining of the cornea, the OD being normal. Intraocular pressure was 16mmHg in both eyes.
+Initial fundoscopic examination of the OI revealed mild vitritis (1+) with no foci of retinitis.
+Topical treatment with corticosteroids and mydriatics was started. Two days later, a slight decrease in cellular tyndall (3+) was observed in the anterior chamber, but fundus examination revealed a peripheral focus of necrotising retinitis in the temporal area associated with retinal vasculitis.
+The patient was admitted and treatment was started with intravenous acyclovir (10 mgr/kg/8 hours), antiplatelet therapy (acetylsalicylic acid 150 mgr/24 hours) and topical treatment was maintained. Prophylactic argon laser photocoagulation was also performed around the area of retinal necrosis.
+
+After 48 hours and after verifying a good response with a decrease in the retinal focus, systemic corticosteroids were introduced at a dose of 1 mg/kg/d, showing a rapid improvement in visual acuity, with a decrease in vitritis and a smaller retinal focus. After 2 weeks, antiviral treatment (famciclovir 500 mgr/12 hours) was switched to oral therapy and a gradual decrease in corticosteroids was started at a rate of 10 mgr each week. Antiviral treatment was continued at maintenance doses for 6 weeks, with regular blood and biochemistry tests to detect renal involvement.
+Six months after the onset of the disease, the patient remained asymptomatic, with a visual acuity of unity in the left eye, healing of the retinal lesions and complete absence of ocular inflammatory activity in both eyes.
+During admission, recent varicella zoster virus infection was confirmed by seroconversion.
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+