Perception errors with double-contrast enema after a positive guaiac test

Jan Kewenter, Jörn Jensen, Marianne Boijsen, Gerhard Lycke, Ulf Tylen

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Between 3 and 6 of 12 colorectal neoplasms larger than 1 cm in diameter were overlooked by each of 4 radiologists in 117 individuals investigated with double-contrast enema (DCE) after a positive guaiac test. Even when the individual results of 2, 3, or 4 experienced radiologists were combined, 2 small carcinomas were overlooked due to perception errors. One of these carcinomas was diagnosed by rectosigmoidoscopy, which is an important and necessary complement to DCE. Although small carcinomas may be missed even with this combination, meticulous exploitation of the 2 methods is absolutely necessary to minimize the risk of missing a colorectal neoplasm. A drawback when 2 or more radiologists read the radiographs is the increased number of false-positive findings.

Original languageEnglish (US)
Pages (from-to)79-82
Number of pages4
JournalGastrointestinal Radiology
Issue number1
StatePublished - Dec 1987
Externally publishedYes


  • Colorectal neoplasm
  • Double-contrast barium enema
  • Fecal occult blood testing
  • Rectosigmoidoscopy

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Gastroenterology


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