NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,865 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.

sigmoid colon
(SIG-moyd KOH-lun)
The S-shaped section of the colon that connects to the rectum.

EnlargeDistal colon; drawing shows parts of the distal colon, including the descending colon and sigmoid colon.

The distal colon includes the descending colon and the sigmoid colon.