NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,780 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

colorectal cancer
(KOH-loh-REK-tul KAN-ser)
Cancer that develops in the colon (the longest part of the large intestine) and/or the rectum (the last several inches of the large intestine before the anus).

EnlargeParts of the colon; drawing shows the ascending colon, cecum, transverse colon, descending colon, sigmoid colon, and rectum.

The colon includes the ascending colon, cecum, transverse colon, descending colon, sigmoid colon, and rectum.