RT Journal Article SR Electronic T1 An unusual complication of Crohn’s colitis JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 768 OP 768 DO 10.1136/gut.2004.057729 VO 54 IS 6 A1 S S Thethy A1 M A Potter YR 2005 UL http://gut.bmj.com/content/54/6/768.abstract AB