fibroxanthoma

A fibrohistiocytic neoplasm.

- atypical f. a solitary, often ulcerated, small, cutaneous, usually benign, tumor composed of foamy histiocytes, spindle cells, and bizarre giant cells; usually found on the exposed skin of older people; microscopically, atypical f. closely resembles malignant fibrous histiocytoma, but originates in the dermis.

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fi·bro·xan·tho·ma (fi″bro-zan-thoґmə) [fibro- + xanthoma] a type of xanthoma containing fibromatous elements; it is sometimes described as synonymous with or a subtype of either benign or malignant fibrous histiocytoma.