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Article
July 1997

Clear Cell Differentiation in Choroidal MelanomaCOMS Report No. 8

Author Affiliations

From the Departments of Ophthalmology and Pathology, Emory University School of Medicine, Atlanta, Ga (Dr Grossniklaus); the Department of Ophthalmology, University of Wisconsin Medical School, Madison (Dr Albert); the Department of Ophthalmology, The Johns Hopkins University School of Medicine, Baltimore, Md (Dr Green); the Department of Ophthalmology, University of Virginia, Charlottesville (Dr Conway); and the Department of Ophthalmology, PorterCare Hospital, Denver, Colo (Dr Hovland).

Arch Ophthalmol. 1997;115(7):894-898. doi:10.1001/archopht.1997.01100160064010
Abstract

Objective:  To describe 2 enucleated eyes of patients enrolled in the Collaborative Ocular Melanoma Study that contained primary choroidal melanoma with clear cell features.

Methods:  During a 9-year period, 1493 eyes enucleated as part of the Collaborative Ocular Melanoma Study routinely processed for histologic examination were evaluated by the pathology review committee (H.E.G, D.M.A, and W.R.G). Two eyes with unusual variants of choroidal melanoma were identified and immunostained for S100 protein and HMB 45. Portions of the tumors were processed for electron microscopic examination.

Results:  Results of electron microscopic examination of both tumors displayed malignant melanoma (mixed cell type with many malignant cells with clear cytoplasm). The cytoplasm of the clear cells stained with periodic acid-Schiff and failed to stain when pretreated with diastase. Results of immunohistochemical stains in both tumors were positive for S100 protein and HMB 45 in the tumor cells. Results of electron microscopic examination showed that the cytoplasm of the clear cells contained scattered glycogen granules, premelanosomes, and melanosomes.

Conclusion:  These cases represent a clear cell variant of malignant melanoma of the choroid. This tumor should not be confused with metastatic clear cell carcinoma to the choroid.

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