title: Frequency and CT patterns of bowel wall thickening proximal to cancer of the colon.
abstract: OBJECTIVE
  This study was performed to determine the frequency and patterns of colon wall thickening seen on CT of patients with adenocarcinoma of the colon.
  
  
  METHODS
  Preoperative abdominal and pelvic CT scans of 185 patients with surgically proven adenocarcinoma of the colon were retrospectively evaluated by three abdominal radiologists for the presence of colon obstruction and colon wall thickening proximal to the colon adenocarcinoma. The distributions and patterns of colon wall thickening were categorized by consensus. CT findings were compared with pathologic findings. Fisher's exact test was used to determine the statistical significance of any associations.
  
  
  RESULTS
  Of 185 patients, CT findings of 20 (10.8%) showed colon wall thickening. Of these, the adenocarcinoma obstructed the colon in 19 patients (p < 0.01). Colon obstruction was partial in 10 patients (53%) and complete in nine (47%). Colon wall thickening was contiguous to the tumor in 14 (70%) patients and noncontiguous in six (30%). Segmental and pancolonic, patchy and diffuse, and dependent and nondependent colon wall thickening was observed in 10 patients (50%) in each category. Associated small-bowel wall thickening was shown in 10 (50%) of the 20 patients. Pathologic examination showed colon wall thickening to be due to edema in all cases.
  
  
  CONCLUSIONS
  Colon wall edema can occur proximal to colon adenocarcinoma, is almost always associated with colon obstruction, and is predominantly contiguous with the obstructing adenocarcinoma.
authors.affiliation: Department of Radiology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Dr., San Antonio, TX 78229-3900, USA.
authors.forename: Lin
authors.initials: L
authors.lastname: Xiong
authors.forename: Kedar N
authors.initials: KN
authors.lastname: Chintapalli
authors.forename: Gerald D
authors.initials: GD
authors.lastname: Dodd
authors.forename: Shailendra
authors.initials: S
authors.lastname: Chopra
authors.forename: Joe A
authors.initials: JA
authors.lastname: Pastrano
authors.forename: Cheryl
authors.initials: C
authors.lastname: Hill
authors.forename: John R
authors.initials: JR
authors.lastname: Leyendecker
authors.forename: Robert M
authors.initials: RM
authors.lastname: Abbott
authors.forename: David
authors.initials: D
authors.lastname: Grayson
authors.forename: John
authors.initials: J
authors.lastname: Feig
mesh_terms: D000230:Adenocarcinoma / Q000150:complications* / Q000000981:diagnostic imaging*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003106:Colon / Q000000981:diagnostic imaging*; D003110:Colonic Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007415:Intestinal Obstruction / Q000150:complications / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed