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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.
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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...

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Related Experiment Video

Updated: Jun 23, 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

Colorectal neoplasm detection using virtual colonoscopy: a feasibility study

H M Fenlon1, D P Nunes, P D Clarke

  • 1Department of Radiology, Boston Medical Center, Boston University School of Medicine, Boston, Massachusetts, USA.

Gut
|November 21, 1998
PubMed
Summary
This summary is machine-generated.

Virtual colonoscopy accurately detects colorectal cancers and large polyps in patients. This non-invasive imaging technique shows promise for diagnosing colonic neoplasms.

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Area of Science:

  • Medical Imaging
  • Gastroenterology
  • Oncology

Background:

  • Virtual colonoscopy (VC) is a non-invasive method for colorectal evaluation.
  • While in vitro studies show accuracy, clinical data on VC for polyp and cancer detection is limited.

Purpose of the Study:

  • To assess VC's effectiveness in detecting colorectal cancers and polyps.
  • To compare VC findings with conventional colonoscopy, surgery, and histopathology.

Main Methods:

  • 38 patients with suspected colorectal cancer underwent VC using thin-section helical CT.
  • CT data was used to create 3D colon fly-through images.
  • Results were correlated with conventional colonoscopy and pathological outcomes.

Main Results:

  • VC identified all 38 cancers and 23 adenomatous polyps >6 mm.
  • Conventional colonoscopy missed four subcentimetre polyps and had one false positive.
  • VC provided complete visualization in 35 patients, compared to 14 with conventional colonoscopy.

Conclusions:

  • Virtual colonoscopy is a feasible technique for colonic evaluation.
  • VC demonstrates potential in diagnosing colorectal cancer and polyps.