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PURPOSE: To report the histopathological and immunohistochemical findings from the iridectomy specimen of a patient with acquired unilateral iris heterochromia due to latanoprost. PATIENT AND METHODS: A 45-year-old women with open-angle glaucoma and unilateral iris heterochromia was evaluated for uncontrolled intraocular pressure increase. Subsequently, the patient underwent trabeculectomy with mitomycin C and an iridectomy specimen was obtained for analysis. RESULTS: The histopathological analysis of the iridectomy specimen did not reveal any nuclear atypia, nuclear crowding, or mitotic figures. Immunohistochemical studies showed that the iris melanocytes were negative for HMB45 and S-100, and weakly positive for Melan A. CONCLUSIONS: Latanoprost-associated iris color change may exhibit a diffuse, uniform, dark velvet-brown appearance, thereby simulating diffuse iris melanoma. Histopathological and immunohistochemical analysis confirmed the benign characteristics of the affected iris melanocytes.
Dr J.C. Tsai, Harkness Eye Institute, 635 West 165th Street, New York, NY 10032, USA
11.4 Prostaglandins (Part of: 11 Medical treatment)