What is the normal cross sectional imaging appearance of the colon?
The normal wall thickness of the colon is paper thin (i.e., <3 mm) when well distended. The diameter of the colon varies greatly, where the cecum generally has the greatest diameter and is usually <9 cm, the transverse colon is usually <6 cm, and the descending colon and sigmoid colon are slightly smaller in caliber. Gas, fecal material, and fluid are normally present in the colon.