Which answers are true? Options to consider when operating for Crohn's disease of the large intestine include:

A. Colectomy and ileorectostomy

B. Colectomy, closure of the rectal stump, and ileostomy.

D. Proctocolectomy and ileostomy.

DISCUSSION: Patients with colonic Crohn's disease who have minimal or mild rectal involvement can be treated by colectomy and ileorectostomy or by colectomy, closure of the rectal stump, and ileostomy. When severe rectal involvement is also present, proctocolectomy with permanent ileostomy is required. The Kock pouch (continent ileostomy) and the ileal pouch–anal canal operation are not performed for Crohn's disease because of the risk of recurrence of Crohn's disease in the ileal pouch in the postoperative period.