- A pigmented tumor of the uveal stroma.
- Usually benign melanoma of the optic disc, appearing in markedly pigmented people as a small deeply pigmented tumor at the edge of the disc, sometimes extending into the retina and choroid; malignant metaplasia is rare.
[megalo- + cyto- + G. -oma; tumor]
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Examples: glitazone, GI cocktail, etc.