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Related Concept Videos

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...
Diverticular Disease of the Colon01:27

Diverticular Disease of the Colon

Diverticular disease involves the formation of diverticula—small sac-like outpouchings of the colonic wall—and their complications. It most commonly affects the sigmoid colon due to higher intraluminal pressure and structural vulnerability. It results from structural weakness and increased pressure in the colon, producing pseudodiverticula that may remain silent or progress to inflammation and serious complications.Structure of DiverticulaIn diverticulosis, these outpouchings are...

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Related Experiment Video

Updated: Jun 22, 2026

Fecal Microbiota Transplantation via Colonoscopy for Recurrent C. difficile Infection
07:06

Fecal Microbiota Transplantation via Colonoscopy for Recurrent C. difficile Infection

Published on: December 8, 2014

Five-year colon surveillance after screening colonoscopy.

David A Lieberman1, David G Weiss, William V Harford

  • 1Department of Veterans Affairs Medical Center, Portland, Oregon 97239, USA. lieberma@ohsu.edu

Gastroenterology
|August 19, 2007
PubMed
Summary

Colonoscopy surveillance outcomes after initial screening are unclear. This study found that baseline findings strongly predict advanced neoplasia risk within 5.5 years, identifying low-risk groups for targeted follow-up.

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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:

  • Colon surveillance outcomes post-colorectal cancer screening are not well-defined.
  • A prospective study was initiated to assess the incidence of advanced neoplasia following screening colonoscopy.

Purpose of the Study:

  • To evaluate the relationship between baseline colonoscopy findings and the risk of developing advanced neoplasia during surveillance.
  • To identify patient subgroups with varying risks for incident advanced colorectal neoplasia.

Main Methods:

  • A prospective study involved 3,121 asymptomatic individuals aged 50-75 undergoing screening colonoscopy.
  • Cohorts were established based on baseline findings (neoplasia present or absent) and followed for 5.5 years.
  • Relative risks for advanced neoplasia were calculated based on baseline adenoma characteristics.

Main Results:

  • 2.4% of patients without baseline neoplasia developed interval advanced neoplasia.
  • Patients with baseline neoplasia showed significantly increased relative risks for advanced neoplasia.
  • Specific risks were elevated for 3+ small adenomas (RR 5.01), large adenomas (RR 6.40), villous adenomas (RR 6.05), and high-grade dysplasia (RR 6.87).

Conclusions:

  • Baseline screening colonoscopy results are strongly associated with the rate of serious incident lesions during surveillance.
  • Patients with 1-2 small tubular adenomas (<10 mm) represent a lower-risk group compared to other patients with colon neoplasia.