title: Colitis: use of CT findings in differential diagnosis.
abstract: OBJECTIVE
  To determine whether colitides can be differentiated based on computed tomographic (CT) features.
  
  
  METHODS
  The CT scans of 117 patients with documented colitis and colon wall thickening were reviewed. Features evaluated included mural thickness and homogeneity, distribution of bowel involvement, and associated mesenteric and small bowel disease.
  
  
  RESULTS
  The mean colon wall thickness in Crohn colitis (11.0 mm +/- 5.1) was significantly greater than in ulcerative colitis (7.8 mm +/- 1.9) (P < .002). Submucosal fat deposition, not observed in the acute colitides, was present significantly more often in ulcerative (61%) than in Crohn colitis (8%) (P = .0001). Exclusive involvement of the right colon and small bowel was most frequent with Crohn and infectious colitis. Abscess was associated almost exclusively with Crohn colitis (35%) but was seen in one patient with radiation colitis.
  
  
  CONCLUSIONS
  Although many CT findings in patients with colitis are nonspecific, some features are helpful in suggesting a specific diagnosis.
authors.affiliation: Department of Diagnostic Radiology, Montreal General Hospital, Quebec, Canada.
authors.forename: L E
authors.initials: LE
authors.lastname: Philpotts
authors.forename: J P
authors.initials: JP
authors.lastname: Heiken
authors.forename: M A
authors.initials: MA
authors.lastname: Westcott
authors.forename: R M
authors.initials: RM
authors.lastname: Gore
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003092:Colitis / Q000000981:diagnostic imaging* / Q000209:etiology; D017091:Colitis, Ischemic / Q000000981:diagnostic imaging; D003093:Colitis, Ulcerative / Q000000981:diagnostic imaging; D003106:Colon / Q000000981:diagnostic imaging; D003424:Crohn Disease / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005260:Female; D006086:Graft vs Host Disease / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D011832:Radiation Injuries / Q000000981:diagnostic imaging; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed