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NCI Dictionary of Cancer Terms

stage 0 colorectal carcinoma in situ  listen  (...KOH-loh-REK-tul KAR-sih-NOH-muh in SY-too)

  Abnormal cells are found in the mucosa (innermost layer) of the colon and/or rectal wall. These abnormal cells may become cancer.

Stage 0 colon/rectal carcinoma in situ; shows a cross-section of the colon/rectum. An inset shows the layers of the colon/rectum wall with abnormal cells in the mucosa layer. Also shown are the submucosa, muscle layers, serosa, a blood vessel, and lymph nodes.