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A xanthoma (pl. xanthomas or xanthomata) (condition: xanthomatosis), from Greek xanthos, Î¾Î±Î½Î¸Î¿Ï, yellow, is a deposition of yellowish cholesterol-rich material that can appear anywhere in the body in various disease states. xanthelasma is a sharply demarcated yellowish collection of cholesterol underneath the skin, usually on or around the eyelids. Strictly, a xanthelasma is a distinct condition, only being called a xanthoma when becoming larger and nodular, assuming tumorous proportions.
xanthoma tendinoÂ´sum, tendinous xanthoma a form manifested by free movable papules or nodules in the tendons, ligaments, fascia, and periosteum, especially on the backs of the hands, fingers, elbows, knees, and heels, in association with some hyperlipoproteinemias and certain other xanthomas. papule, nodule or plaque in the skin due to lipid deposits; the color of a xanthoma is usually yellow, but may be brown, reddish, or cream. Microscopically, the lesions show light cells with foamy protoplasm (foam cells, xanthoma cells). They occur most commonly in White Leghorn chickens and rarely in other species.