melanoma in situ

Definition / meaning of melanoma in situ

Abnormal melanocytes (cells that make melanin, the pigment that gives skin its color) are found in the epidermis (outer layer of the skin). These abnormal melanocytes may become cancer and spread into nearby normal tissue. Also called stage 0 melanoma.

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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