Parts C and D courtesy of Robert S. Feder, MD.
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Cornea/External Disease
Inflammation of the corneal stroma. A, Suppurative keratitis. B, Nonsuppurative, nonnecrotizing (disciform) stromal keratitis. C, Immune ring. D, Peripheral ulcerative keratitis. An ovoid area of thinning (arrow) can be seen in the inferonasal quadrant.