title: [The computed tomographic morphology of Crohn's disease and ulcerative colitis].
abstract: OBJECTIVE
  To assess the value of computed tomography for the diagnosis of Crohn's disease and ulcerative colitis.
  
  
  METHODS
  We analysed the CT examinations of 109 patients with 197 involved bowel locations. 81 patients suffered from Crohn's disease, 28 from ulcerative colitis. Diagnosis was based on the combination of clinical, endoscopic and histopathologic findings. Three radiologists evaluated the CT series concerning the presence of morphologic changes analogous to conventional radiographic findings.
  
  
  RESULTS
  In Crohn's disease, we found irregular outer contours in 26% of cases. The bowel wall was thickened in 82%. In acute phases, the bowel wall was thickened in 100%. Abscess and fistula as complications of inflammatory disease were present in 26 and 14% respectively. In ulcerative colitis, a target sign of the bowel wall was present in 40%, whereas in Crohn's disease a homogeneous wall density was present in all but two cases. Reduced attenuation due to submucosal fat deposits was found in 16% and mucosal tunneling in 27% of cases with ulcerative colitis. Even if severe mucosal destructions were found, the outer contour of the gut was smooth and regular in 95% of the ulcerative colitis cases.
  
  
  CONCLUSIONS
  CT can provide additional information on acuity, extent and complications in inflammatory bowel disease. In combination with conventional radiographic findings a three-step classification for Crohn's disease and ulcerative colitis (early changes, acute and chronic phase) can be proposed.
authors.affiliation: Klinik für Radiologische Diagnostik, RWTH Aachen.
authors.forename: H M
authors.initials: HM
authors.lastname: Klein
authors.forename: B
authors.initials: B
authors.lastname: Wein
authors.forename: G
authors.initials: G
authors.lastname: Adam
authors.forename: D
authors.initials: D
authors.lastname: Ruppert
authors.forename: R W
authors.initials: RW
authors.lastname: Günther
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003093:Colitis, Ulcerative / Q000145:classification / Q000000981:diagnostic imaging* / Q000473:pathology; D003287:Contrast Media; D003424:Crohn Disease / Q000145:classification / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D006801:Humans; D007422:Intestines / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods
chemical_list: D003287:Contrast Media
vernacular_title: Computertomographische Morphologie von Morbus Crohn und Colitis ulcerosa.