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National Cancer Institute U.S. National Institutes of Health www.cancer.gov
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Melanoma

A malignant tumor composed of melanocytes, frequently exhibiting elevated mitotic activity, pleomorphism, tumor necrosis, and/or metastasis. A report of melanoma should include: location of the lesion (junctional, dermal, or both), pigmentation status (if amelanotic), and precursor lesions (if present).