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High-resolution chromoendoscopy for classifying colonic polyps: a multicenter study.

Glenn M Eisen1, Christopher Y Kim, David E Fleischer

  • 1Division of Gastroenterology, Department of Medicine, Georgetown University Medical Center, Washington, DC, USA.

Gastrointestinal Endoscopy
|April 30, 2002
PubMed
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High-resolution chromoendoscopy with indigo carmine dye accurately distinguishes between adenomatous and non-adenomatous colorectal polyps. This technique aids in determining polyp histology, improving diagnostic capabilities during endoscopic procedures.

Area of Science:

  • Gastroenterology
  • Endoscopy
  • Pathology

Background:

  • Chromoendoscopy is a technique that uses dyes to enhance visualization of the colonic mucosa.
  • Distinguishing between adenomatous and non-adenomatous polyps is crucial for colorectal cancer prevention.
  • High-resolution imaging combined with chromoendoscopy may improve polyp histology determination.

Purpose of the Study:

  • To evaluate the accuracy of high-resolution chromoendoscopy with indigo carmine dye for determining the histology of colonic polyps.
  • To assess the reliability of this technique across multiple medical centers.

Main Methods:

  • A multicenter trial involving 4 academic centers and 1 primary care practice.
  • 520 polyps (≥10 mm) from 299 patients were visualized using high-resolution chromoendoscopy with indigo carmine dye.

Related Experiment Videos

  • Endoscopists predicted polyp histology based on surface characteristics, followed by surgical resection and histopathologic evaluation.

    • Main Results:

    • Of the resected polyps, 37% were adenomas, 43% were hyperplastic, and 20% were other types.
    • High-resolution chromoendoscopy with indigo carmine dye could not classify 7.7% of polyps.
    • For the classifiable polyps, sensitivity was 82%, specificity 82%, and negative predictive value 88% for detecting adenomatous polyps.

    Conclusions:

    • High-resolution chromoendoscopy with indigo carmine dye effectively differentiates adenomatous from non-adenomatous diminutive colorectal polyps.
    • The technique provides reliable morphologic detail for histological assessment.
    • Results were consistent across academic and primary care settings.