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Related Concept Videos

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,...
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 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:
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...
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...
Lower GI Series: Barium Enema01:23

Lower GI Series: Barium Enema

A Barium Enema, or a lower GI series, is a specialized radiographic examination designed to visualize the lower gastrointestinal tract, specifically the colon and rectum. This procedure is instrumental in diagnosing various conditions such as colorectal cancer, polyps, diverticulosis, and inflammatory bowel disease.
Procedure Details
The examination begins by inserting a lubricated rectal tube into the patient's rectum to administer a radiopaque barium solution. The barium flow is carefully...

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Related Experiment Video

Updated: Jun 30, 2026

Flexible Colonoscopy in Mice to Evaluate the Severity of Colitis and Colorectal Tumors Using a Validated Endoscopic Scoring System
15:49

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

Published on: October 17, 2013

Does a negative screening colonoscopy ever need to be repeated?

H Brenner1, J Chang-Claude, C M Seiler

  • 1Division of Clinical Epidemiology and Aging Research, German Cancer Research Centre, Heidelberg, Germany. h.brenner@dkfz-heidelberg.de

Gut
|February 14, 2006
PubMed
Summary
This summary is machine-generated.

Individuals with negative screening colonoscopy results have a significantly reduced long-term risk of colorectal cancer. Repeat colonoscopies may not be necessary for 20 years or more, enhancing screening program efficiency.

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E-Patient Counseling Trial (E-PACO): Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy

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

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Related Experiment Videos

Last Updated: Jun 30, 2026

Flexible Colonoscopy in Mice to Evaluate the Severity of Colitis and Colorectal Tumors Using a Validated Endoscopic Scoring System
15:49

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

Published on: October 17, 2013

E-Patient Counseling Trial (E-PACO): Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy
06:28

E-Patient Counseling Trial (E-PACO): Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy

Published on: August 1, 2019

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

Area of Science:

  • Gastroenterology
  • Oncology
  • Preventive Medicine

Background:

  • Screening colonoscopy is a key tool for reducing colorectal cancer (CRC) incidence and mortality.
  • Optimal surveillance intervals after negative colonoscopy findings remain undefined.
  • This study assesses the long-term CRC risk following a negative colonoscopy.

Purpose of the Study:

  • To evaluate the long-term risk of clinically manifest colorectal cancer in individuals with negative colonoscopy findings.
  • To inform guidelines on recommended follow-up intervals after negative screening colonoscopies.

Main Methods:

  • A population-based case-control study in Germany involving 380 cases and 485 controls.
  • Detailed colonoscopy histories were collected via interviews and medical records.
  • Adjusted odds ratios (aOR) were calculated to compare CRC risk based on prior negative colonoscopy and time since the procedure.

Main Results:

  • Negative colonoscopy was associated with a 74% lower risk of CRC (aOR=0.26).
  • This protective effect persisted for 20 years or more post-colonoscopy.
  • Significantly lower risks were observed for specific cancer sites (sigmoid, rectal) and age groups (55-64, 65+).

Conclusions:

  • Individuals with negative colonoscopy findings have a very low long-term risk of developing colorectal cancer.
  • Screening intervals could potentially be extended to 20 years or more.
  • Extended intervals may improve colonoscopy screening program feasibility and cost-effectiveness while reducing potential complications.