A tumor formed by proliferation of epithelial squamous cells. SEE ALSO: keratoacanthoma. [acantho- + G. -oma, tumor]
- clear cell a. a small sharply demarcated benign epidermal tumor of a leg or arm with acanthosis and accumulation of glycogen in keratinocytes having pale-staining cytoplasm.

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ac·an·tho·ma -'thō-mə n, pl -mas also -ma·ta -mət-ə a tumor originating in the skin and developing through excessive growth of skin cells esp. of the stratum spinosum

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ac·an·tho·ma (ak″an-thoґmə) pl. acanthomas, acanthoґmata [acanth- + -oma] a tumor composed of epidermal or squamous cells.

Medical dictionary. 2011.

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