Contributor: Jesse Vislisel, MD
Photographer: Brice Critser, CRA (fig 1), Stefani Karakas, CRA(fig 2)
Toxoplasmosis is the most common cause of posterior uveitis. Active lesions have a classic "headlight in fog" appearance with a focal, white, fluffy lesion adjacent to an old scar visible through the associated granulomatous uveitis and vitritis as seen in Figure 1. Inactive lesions appear as a chorioretinal scar in the posterior pole, often within the macula as seen in Figure 2.
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