Abstract
Two cases of acute retinal necrosis (ARN) and severe vitritis in immunologically compromised patients, one monocular and one binocular, were found to have similar echographic characteristics. The response to appropriate medication and vitreous and retinal biopsy confirmed the diagnoses. Subsequently, a third case in an immunologically competent patient was found to have identical echographic findings, suggesting a diagnosis of herpetic ARN, which permitted appropriate treatment to be given. The typical echographic picture consists of vitreous opacities, vitreous schisis and loculation (cyst-like), vitreo—retinal traction, retinal detachment, subretinal opacities and choroidal thickening.
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