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an anaplastic melanoma consisting of cells derived from melanocytes but not forming melanin.
amelanotic melanoma A rare, poorly differentiated form of melanoma, which arises in patients with a previous pigmented melanoma, in particular the desmoplastic melanomas.
amelanotic melanoma Dermatology A rare, poorly differentiated form of melanoma, which occurs in Pts with a previous pigmented melanoma. See Melanoma, Regression.