University of Iowa Health Care

Ophthalmology and Visual Sciences

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Diffuse Unilateral Subacute Neuroretinitis (DUSN)

Contributor: David Phillips, MD

This 45-year-old male presented with blurry vision in his left eye and was referred to the University of Iowa for unilateral uveitis. A subretinal nematode was identified on exam next to a crop of yellow-white macular lesions. He was diagnosed with diffuse unilateral subacute neuroretinitis (DUSN), likely secondary to raccoon roundworm (Baylisascaris procyonis) as the patient was an avid outdoorsman and hunter. The nematode was killed by laser and the patient completed albendazole 400mg/day for 30 days. Included are photos demonstrating the nematode in two different locations and after laser treatment.

(Click any image for higher resolution)


Nematode in the macula
Figure 1: Nematode in the macula and macular inflammation

Out take of above image


Nematode in periphery
Figure 2: Nematode in the periphery before laser


Scar in macula after laser
Figure 3: Macular scar from previous inflammation and peripheral laser from killed nematode



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Ophthalmic Atlas Images by EyeRounds.org, The University of Iowa are licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

last updated: 10/18/2013
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