Which iris nodules are located at the pupil margin?

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Study for the NBEO Ocular Disease Part 1 Test. Use flashcards and multiple choice questions, each with hints and explanations, to prepare for your exam! Get ready for your success!

Multiple Choice

Which iris nodules are located at the pupil margin?

Explanation:
Pupillary margin localization helps distinguish iris nodules seen with anterior uveitis. Koeppe nodules form exactly at the pupillary margin on the iris surface, making them the nodules you’d expect to see at the edge where the iris meets the pupil. In contrast, Busacca nodules sit on the iris surface away from the pupil, within the stroma. Keratic precipitates lie on the corneal endothelium, not the iris, and Lisch nodules are pigmented iris lesions seen in neurofibromatosis type 1, not specifically tied to the pupil margin. So, the nodules located at the pupil margin are Koeppe nodules.

Pupillary margin localization helps distinguish iris nodules seen with anterior uveitis. Koeppe nodules form exactly at the pupillary margin on the iris surface, making them the nodules you’d expect to see at the edge where the iris meets the pupil. In contrast, Busacca nodules sit on the iris surface away from the pupil, within the stroma. Keratic precipitates lie on the corneal endothelium, not the iris, and Lisch nodules are pigmented iris lesions seen in neurofibromatosis type 1, not specifically tied to the pupil margin. So, the nodules located at the pupil margin are Koeppe nodules.

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