NCI Dictionary of Cancer Terms
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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).