title: Utility of flexible sigmoidoscopy as an adjunct to double-contrast barium enema examination.
abstract: BACKGROUND
  There is controversy regarding the most appropriate investigation for suspected colorectal carcinoma. We offered these patients same-day flexible sigmoidoscopy (FS) and double-contrast barium enema (DCBE).
  
  
  METHODS
  We reviewed the results of 117 consecutive adult patients. All patients underwent FS followed by DCBE on the same day. The radiographs were reviewed by two of the authors who were blinded to the clinical information, flexible sigmoidoscopy reports, and the original DCBE report.
  
  
  RESULTS
  One hundred seventeen patients made up the study population. Thirty-four of the 117 patients had polyps and/or carcinoma. Three malignant tumours were detected by DCBE; one of these was also seen on FS, and the other two cancers were out of FS range. Fifty-three polyps were found by FS; nine were removed by biopsy prior to the enema examination. Of the 44 remaining polyps, DCBE failed to detect 87% of the 0-9-mm group and 67% of the >9-mm group. Ten polyps were seen only on DCBE; seven of these 10 were beyond the range of the sigmoidoscope, and the three remaining polyps were less than 5 mm.
  
  
  CONCLUSIONS
  DCBE is insensitive in the detection of rectosigmoid polyps. FS should continue to be used as a complementary examination to DCBE in the investigation of suspected colorectal carcinoma.
authors.affiliation: Department of Radiology, McMaster University Medical Centre, Hamilton, Ontario, Canada.
authors.forename: Y
authors.initials: Y
authors.lastname: Cheong
authors.forename: R
authors.initials: R
authors.lastname: Farrow
authors.forename: C S
authors.initials: CS
authors.lastname: Frank
authors.forename: G W
authors.initials: GW
authors.lastname: Stevenson
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001466:Barium Sulfate; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D003287:Contrast Media / Q000008:administration & dosage*; D004733:Enema; D006801:Humans; D007417:Intestinal Polyps / Q000175:diagnosis / Q000000981:diagnostic imaging; D008875:Middle Aged; D011859:Radiography; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D012812:Sigmoidoscopy
chemical_list: D003287:Contrast Media; D001466:Barium Sulfate