<prompt> A 22-year-old man with inflammatory bowel disease is noted to have a string sign in the ileal area on barium enema. In which of the following conditions is this sign most often seen? See Fig. below.in the stenotic or non-stenotic phase of the diseasein the stenotic phase onlyas a rigid, non-distensible phenomenonwith gastric involvement  <response>: The string sign represents long areas of circumferential inflammation and fibrosis. It is seen in the stenotic and non-stenotic phase of Crohns disease. In addition to the string sign, abnormal puddling of barium and fistulous tracts are other helpful x-ray signs of ileitis. Other radiologic findings in Crohns disease include skip lesions, rectal sparing, small ulcerations, and fistulas. 