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Flexible Colonoscopy in Mice to Evaluate the Severity of Colitis and Colorectal Tumors Using a Validated Endoscopic Scoring System
Published on: October 17, 2013
Is colonoscopy indicated for small adenomas found by screening flexible sigmoidoscopy?
M B Wallace1, J A Kemp, Y M Trnka
1Brigham and Women's Hospital, Boston, Massachusetts, USA.
Annals of Internal Medicine
|September 5, 1998
Summary
Patients with small distal adenomas (≤5mm) found during sigmoidoscopy have a low risk of advanced proximal polyps. Further colonoscopy may not be necessary for this low-risk group, improving screening efficiency.
Area of Science:
- Gastroenterology
- Oncology
- Preventive Medicine
Background:
- Flexible sigmoidoscopy is a screening tool for colorectal cancer.
- Controversy exists regarding the need for colonoscopy after detecting small distal adenomas during sigmoidoscopy.
Purpose of the Study:
- To determine the prevalence of advanced polyps in the proximal colon.
- To evaluate the necessity of colonoscopy for patients with small distal adenomas detected via sigmoidoscopy.
Main Methods:
- Prospective cohort study involving asymptomatic patients over 50 years old.
- Polyps identified during sigmoidoscopy were biopsied and characterized.
- Patients with distal adenomas were offered colonoscopy to assess proximal lesions.
Main Results:
- Among 4490 patients, 8.9% had neoplastic lesions.
- Patients with a single distal tubular adenoma (1-5mm) had a 0% prevalence of advanced proximal polyps.
- The prevalence of advanced proximal polyps increased significantly with multiple or larger distal adenomas.
Conclusions:
- Patients with single, small distal tubular adenomas (≤5mm) exhibit a low prevalence of advanced proximal polyps.
- Colonoscopy may not be beneficial for this specific low-risk patient group.
- Findings can help refine screening protocols and resource allocation.
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