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Related Concept Videos

Endoscopic Procedures II: Colonoscopy01:25

Endoscopic Procedures II: Colonoscopy

The colon, or large intestine, is the final segment of the digestive system. Its primary functions include absorbing water and vitamins produced by gut bacteria and transforming waste from liquid to solid to form stool. In adults, the large intestine is approximately 5 feet long and consists of four main sections:
Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy01:26

Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy

Sigmoidoscopy and laparoscopy are distinct medical procedures that enable physicians to internally inspect different parts of the GI tract. Although they serve different purposes, each is essential for diagnosing and, in some cases, treating various medical conditions.
Sigmoidoscopy
Sigmoidoscopy is a diagnostic procedure that uses a flexible sigmoidoscope equipped with a light source and camera to examine the rectum and sigmoid colon. The procedure involves inserting the tube through the anus...
Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and solid...
Endoscopic Procedures III: Video Capsule Endoscopy01:28

Endoscopic Procedures III: Video Capsule Endoscopy

Capsule endoscopy, or wireless or video capsule endoscopy, is a diagnostic procedure for examining the entire gastrointestinal tract. Patients swallow a capsule about the size of a vitamin tablet. The capsule is equipped with a transmitter, a battery, an LED light source, and a color video camera to capture images throughout the gastrointestinal tract. This procedure is particularly useful for diagnosing conditions such as Crohn's disease, ulcerative colitis, tumors, polyps, ulcers, unexplained...
Inflammatory Bowel Disease V: Surgical Management01:21

Inflammatory Bowel Disease V: Surgical Management

Surgical interventions for inflammatory bowel disease (IBD), which includes ulcerative colitis and Crohn's disease, are essential in managing symptoms and addressing complications. The selection of surgical procedures is contingent upon the specific conditions and complications that stem from these illnesses.
Here are some common surgical interventions for IBD:

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Related Experiment Video

Updated: May 16, 2026

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists
03:43

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists

Published on: July 11, 2025

Factors associated with failed polyp retrieval at screening colonoscopy.

Yoriaki Komeda1, Noriko Suzuki, Marshall Sarah

  • 1The Wolfson Unit for Endoscopy, St. Mark's Hospital and Academic Institute, Imperial College London, London, United Kingdom.

Gastrointestinal Endoscopy
|December 6, 2012
PubMed
Summary

Polyp retrieval failure during colonoscopy is often due to small size and cold snare removal. This impacts accurate polyp diagnosis, highlighting the need for improved techniques.

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Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists
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Competing-Risk Nomogram for Predicting Cancer-Specific Survival in Multiple Primary Colorectal Cancer Patients after Surgery

Published on: September 27, 2024

Area of Science:

  • Gastroenterology
  • Endoscopy
  • Colorectal Cancer Screening

Background:

  • Colonoscopy is crucial for reducing colorectal cancer mortality by detecting and removing polyps.
  • Accurate histologic assessment of removed polyps is essential for diagnosis and treatment planning.

Purpose of the Study:

  • To investigate the factors contributing to the failure of polyp retrieval during colonoscopy.
  • To identify specific polyp characteristics and removal methods associated with retrieval difficulties.

Main Methods:

  • Prospective collection of data from bowel cancer screening colonoscopies.
  • Retrospective analysis of 4383 polyps removed from 1495 patients.
  • Examination of polyp size, shape, location, removal method, and bowel preparation quality.

Main Results:

  • The overall polyp retrieval rate was 93.9%, with a 6.1% failure rate (267 polyps).
  • Factors significantly associated with retrieval failure included small polyp size, sessile morphology, and cold snare polypectomy.
  • Proximal colon location also correlated with lower retrieval success.

Conclusions:

  • Small polyp size and cold snare removal are independent risk factors for polyp retrieval failure.
  • Retrieving small, sessile, and proximal polyps presents significant challenges.
  • Optical diagnosis may serve as a future alternative to histologic examination for difficult-to-retrieve lesions.