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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,...
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...
Serum Laboratory Studies, Stool Test, Breath Test01:30

Serum Laboratory Studies, Stool Test, Breath Test

Gastrointestinal (GI) diagnostic studies are pivotal in confirming, ruling out, diagnosing, or staging various diseases, including cancers. Following diagnosis, allocating time for discussions with the patient and providing informational resources is crucial. Diagnostic assessments of the GI tract often occur in outpatient settings like endoscopy suites or GI labs. Preparation for these tests may include dietary restrictions, fasting, liquid bowel preparations, laxatives, enemas, and the...

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Related Experiment Video

Updated: Jul 19, 2026

Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection
07:35

Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection

Published on: June 8, 2020

Colorectal cancers found after a complete colonoscopy.

William D Farrar1, Mandeep S Sawhney, Douglas B Nelson

  • 1Section of Gastroenterology, Minneapolis VA Medical Center, Minneapolis, Minnesota, USA.

Clinical Gastroenterology and Hepatology : the Official Clinical Practice Journal of the American Gastroenterological Association
|September 26, 2006
PubMed
Summary

Incomplete polypectomy is linked to interval colorectal cancers, which occur after a clear colonoscopy. Further research is needed to improve surveillance and prevent these cancers.

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A Genetically Engineered Mouse Model of Sporadic Colorectal Cancer
06:01

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Published on: July 6, 2017

Area of Science:

  • Gastroenterology
  • Oncology
  • Cancer Research

Background:

  • Colorectal cancer surveillance aims to detect and prevent malignancies.
  • Interval colorectal cancers, diagnosed between surveillance examinations, pose a challenge to current strategies.
  • Understanding the factors contributing to interval cancers is crucial for enhancing patient outcomes.

Purpose of the Study:

  • To investigate the association between interval colorectal cancers and inadequate colonoscopy.
  • To determine if incomplete polypectomy contributes to the development of interval colorectal cancers.
  • To explore the role of aggressive biologic behavior in interval colorectal cancer formation.

Main Methods:

  • A retrospective analysis of a colorectal cancer registry was conducted.
  • Interval cancers (diagnosed within 5 years of a complete colonoscopy) were compared to sporadic cancers (diagnosed on first colonoscopy).
  • Patient, colonoscopy, and tumor characteristics were analyzed for both groups.

Main Results:

  • Interval colorectal cancers occurred in 5.4% of cases, often at previous polypectomy sites.
  • These cancers were more common in the right colon and smaller than sporadic cancers.
  • Colonoscopy quality, endoscopist factors, and tumor characteristics did not significantly correlate with interval cancers.

Conclusions:

  • Incomplete polypectomy is a potential factor in the development of interval colorectal cancers.
  • No significant association was found between other colonoscopy-related factors or tumor characteristics and interval cancers.
  • Improved polypectomy techniques may be key to reducing interval colorectal cancer incidence.