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Related Experiment Video

Updated: Jul 8, 2026

Flexible Colonoscopy in Mice to Evaluate the Severity of Colitis and Colorectal Tumors Using a Validated Endoscopic Scoring System

Flexible Colonoscopy in Mice to Evaluate the Severity of Colitis and Colorectal Tumors Using a Validated Endoscopic Scoring System

Published on: October 16, 2013

Classic "outlet" rectal bleeding does not require full colonoscopy to exclude significant pathology.

Eric L Marderstein¹, James M Church

¹Department of Colorectal Surgery, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA. eric.marderstein@gmail.com

Diseases of the Colon and Rectum

|January 4, 2008

Summary

For patients with classic outlet bleeding, a full colonoscopy has a low diagnostic yield. Flexible sigmoidoscopy is sufficient to rule out significant pathology when no other indications exist.

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Area of Science:

Gastroenterology
Colorectal Surgery
Diagnostic Endoscopy

Background:

Rectal bleeding is a common symptom requiring investigation.
Full diagnostic colonoscopy is frequently employed to rule out significant colorectal pathology.
Outlet bleeding, characterized by bright red blood during or after defecation, warrants specific diagnostic evaluation.

Purpose of the Study:

To evaluate the diagnostic yield of complete colonoscopy in patients presenting with classic "outlet" rectal bleeding.
To determine if complete colonoscopy is necessary for patients with outlet bleeding and no other risk factors for colorectal neoplasia.

Main Methods:

Prospective data collection of patients undergoing colonoscopy by a single endoscopist.
Analysis of colonoscopy findings based on the indication for the procedure (outlet bleeding, suspicious bleeding, hemorrhage, occult bleeding).
Categorization of significant lesions including adenomas >1 cm, villous adenomas, cancer in situ, and invasive cancer.

Main Results:

Only 6.7% of patients with outlet bleeding had significant colonoscopy findings, compared to 17.2% in other bleeding groups (P<0.001).
The incidence of invasive cancer was significantly lower in the outlet bleeding group (1% vs. 3.6%; P<0.01).
Younger patients (<50 years) with outlet bleeding demonstrated a particularly low yield (1.6% for adenomas >1 cm, no invasive cancers).

Conclusions:

Complete diagnostic colonoscopy has a low yield for patients with classic outlet bleeding.
Flexible sigmoidoscopy is adequate for excluding significant pathology in patients with classic outlet bleeding and no other indications for colonoscopy.