NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,798 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.

proximal colon
(PROK-sih-mul KOH-lun)
The first and middle parts of the colon. The proximal colon includes the cecum (a pouch that connects the small intestine to the colon), the ascending colon (the right side of the colon), and the transverse colon (the part of the colon that goes across the body between the right and left sides of the colon).

EnlargeProximal colon; drawing shows parts of the proximal colon, including the transverse colon, ascending colon, and cecum.

The proximal colon includes the transverse colon, ascending colon, and the cecum.