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In surgeries like the one Francis most likely underwent, doctors excise a part of the colon called the sigmoid colon where diverticulitis is most common.

Its right side includes the cecum and the ascending colon, while the left side is made up of the descending colon, the sigmoid colon and the rectum.

At the time, the Argentine leader was suffering from a sigmoiditis, an inflammation or infection of the sigmoid colon.

Doctors said was suffering from a sigmoiditis, an inflammation or infection of the sigmoid colon.

Diverticulosis is the occurrence of small pockets, or tics, in the wall of the bowel, primarily the sigmoid colon just above the rectum.