Abstract
Abstract Melanocytoma, also known as magnocellular nevus, most commonly occurs on the optic disk, sometimes involving the adjacent retina or choroid. It may be confused with malignant melanoma both clinically and histopathologically. Histopathologically, melanocytoma is composed of deeply pigmented, round to oval nevus cells without malignant features. Typically, melanocytoma is benign1 and shows a stationary course, although minor enlargement occurs in 10%–15% of cases. In rare cases, severe visual loss can result from tumor necrosis, compressive optic neuropathy, or malignant transformation, which occurs in 1%–2% of cases. Therefore, it is generally a benign lesion requiring minimal intervention but warrants lifetime follow-up.
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