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NCI Dictionary of Cancer Terms


nonmelanoma carcinoma in situ  listen  (non-MEH-luh-NOH-muh KAR-sih-NOH-muh in SY-too)

  Abnormal cells are found in the squamous cell or basal cell layer of the epidermis (topmost layer of the skin). These abnormal cells may become cancer and spread into nearby normal tissue. Also called stage 0 nonmelanoma skin carcinoma in situ.

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Stage 0 nonmelanoma skin carcinoma in situ; drawing shows skin anatomy with abnormal cells in the epidermis (outer layer of the skin). Also shown are the dermis (inner layer of the skin) and subcutaneous tissue below the dermis.