Proctosigmoiditis is a form of left-sided ulcerative colitis that affects the rectum and sigmoid colon rather than a larger area of the colon. It usually causes diarrhea. Proctosigmoiditis affects ...

In 2009, Michael Sheridan was diagnosed with ulcerative colitis ... But the tumor only appeared to be in the sigmoid colon. It seemed the rest of his colon was healthy. “There’s other ...