<prompt> Pipe stem colon on barium enema is seen with:Crohns diseaseUlcerative colitisIschemic colitisAmoebic colitis  <response>: Ans. B. Ulcerative colitisBarium Enema Findings in Ulcerative Colitis: Earliest finding on air-contrast Barium enema is loss of and fine mucosal granularity. Pseudo-polyps which are scattered islands of edematous mucosa in vast expanse of ulcerated mucosa Double-tracking-tong, longitudinal ulcers in submucosa Bowel margins appear spicule like from tiny, multiple ulcerations Collar button ulcers- rom undermining Shortening of the colon-may be from spasm of longitudinal muscles or from irreversible fibrosis lead- pipe colonpipe stem colon Loss of haustration on left side of colon. 