title: Radiologic appearance of recurrent ileal Crohn disease.
abstract: BACKGROUND
  Postoperative recurrence of Crohn disease is a common problem. It has been assumed that the radiologic patterns are similar in de novo and recurrent ileal disease, but there has been little in the literature to actually confirm this belief.
  
  
  METHODS
  We retrospectively reviewed the small bowel examinations of 105 consecutive patients with a proven diagnosis of Crohn disease: a control group of 47 patients with no prior surgery and a postoperative group of 58 patients with resections. Of the latter, 22 had ileocecal or ileocolonic resections and 36 patients had ileocecal or ileocolonic and extensive enteric resections. We examined the disease sites and compared the disease patterns in both groups.
  
  
  RESULTS
  Fifty-six of 58 (97%) postoperative patients had anastomotic recurrences with proximal extension from 3 to 25 cm, with a mean of 10.5 cm; none showed distal disease extension. Two (3%) had enteric recurrences with neoterminal ileal sparing. There were no statistically significant differences in the length of distal/terminal ileal disease and the frequency of skip lesions in de novo and recurrent disease. There were lower frequencies of mucosal thickening, ulceration/ulceronodular mucosa, sacculation, loop separation, sinuses, and masses and a higher frequency of strictures in recurrent disease than in de novo disease. There was also a lower frequency of ulceration or ulceronodular mucosa after extensive resection than after limited resection.
  
  
  CONCLUSIONS
  Postoperative patients with ileal Crohn disease show a marked preponderance for anastomotic recurrence with proximal disease extension. There are significant differences in disease patterns in patients with de novo and recurrent disease.
authors.affiliation: Department of Medical Imaging, St. Michael's Hospital and University of Toronto, Canada. zaleva@smh.toronto.on.ca
authors.forename: A H
authors.initials: AH
authors.lastname: Zalev
authors.forename: W
authors.initials: W
authors.lastname: Deitel
authors.forename: S
authors.initials: S
authors.lastname: Kundu
authors.forename: G
authors.initials: G
authors.lastname: Tomlinson
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000714:Anastomosis, Surgical; D003424:Crohn Disease / Q000000981:diagnostic imaging* / Q000601:surgery; D005260:Female; D006801:Humans; D007077:Ileal Diseases / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012008:Recurrence; D012189:Retrospective Studies