Which answers are true? In contrast to ulcerative colitis, Crohn's disease of the colon:

B. Seldom presents with daily hematochezia.

C. Is usually segmental rather than continuous.

DISCUSSION: Crohn's disease of the colon is a patchy, segmental, chronic, transmural inflammatory process that penetrates the bowel wall to form fistulas but seldom causes rectal bleeding. In contrast, ulcerative colitis is a mucosal ulcerating process that extends continuously from the rectum to the more proximal colon and frequently bleeds. Both diseases can develop toxic megacolon, and both predispose the patient to increased risk of malignancy of the large intestine over the long term.