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Related Concept Videos

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
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In gastric emptying studies, a meal's liquid and...
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An Esophagogastroduodenoscopy (EGD) is a diagnostic procedure in which an endoscopist uses a flexible, lighted endoscope to visualize the upper gastrointestinal (GI) tract. The procedure includes visualizing the oropharynx, esophagus, stomach, and the first part of the small intestine, the duodenum.
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Endoscopic Procedures II: Colonoscopy01:25

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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,...
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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.
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Related Experiment Video

Updated: May 7, 2026

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Surveillance after Endoscopic Resection for Colorectal Tumors: A Comprehensive Review.

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  • 1Division of Endoscopy, Shizuoka Cancer Center, Shizuoka, Japan.

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Developing minimal surveillance programs after colorectal tumor resection is crucial for reducing cancer incidence and mortality. Guidelines are evolving based on risk stratification and new evidence to optimize patient outcomes and quality of life.

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Area of Science:

  • Gastroenterology
  • Oncology
  • Public Health

Background:

  • Surveillance after endoscopic resection of colorectal tumors aims to decrease colorectal cancer (CRC) incidence and mortality.
  • Minimal, cost-effective surveillance programs are desirable due to limited endoscopic capacity.
  • International guidelines (ESGE, USMSTF) and Japanese guidelines stratify risk and propose surveillance protocols.

Purpose of the Study:

  • To summarize randomized controlled trials evaluating surveillance intervals post-endoscopic resection.
  • To compare international and Japanese guidelines for colorectal tumor surveillance.
  • To highlight the development and principles of Japanese surveillance guidelines.

Main Methods:

  • Summarization of key randomized controlled trials (NPS, Nottingham Study, JPS).
  • Comparative analysis of European Society of Gastrointestinal Endoscopy (ESGE), US Multi-Society Task Force (MSTF), and Japanese guidelines.
  • Categorization of lesions including low-risk adenoma, high-risk adenoma, advanced neoplasia, piecemeal resection, and serrated lesions.

Main Results:

  • Guidelines stratify risk based on initial endoscopy findings.
  • Surveillance programs are tailored to different risk groups.
  • International and Japanese guidelines address various lesion types and resection methods.

Conclusions:

  • Risk-stratified surveillance guidelines have been developed in Japan.
  • Effective clinical utilization and revision based on new evidence are essential for guideline meaningfulness.
  • Further research is needed in Japan to address current knowledge gaps in colorectal cancer surveillance.