Barium enema showing acute colonic dilation in ulcerative colitis Barium enema showing acute colonic dilation in ulcerative colitis. Note dilation of the transverse colon, the multiple irregular densities in the lumen that represent pseudopolyps, and the loss of haustral markings. Source: Large Intestine, CURRENT Diagnosis & Treatment: Surgery, 14e Citation: Doherty GM. CURRENT Diagnosis & Treatment: Surgery, 14e; 2015 Available at: https://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1202/doh_ch30_f018.png&sec=71522989&BookID=1202&ChapterSecID=71522614&imagename= Accessed: November 03, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved