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Related Concept Videos

Endoscopic Procedures II: Colonoscopy01:25

Endoscopic Procedures II: Colonoscopy

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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:
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Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

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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,...
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Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy01:26

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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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Inflammatory Bowel Disease V: Surgical Management01:21

Inflammatory Bowel Disease V: Surgical Management

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Surgical interventions for inflammatory bowel disease (IBD), which includes ulcerative colitis and Crohn's disease, are essential in managing symptoms and addressing complications. The selection of surgical procedures is contingent upon the specific conditions and complications that stem from these illnesses.
Here are some common surgical interventions for IBD:
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Diverticular Disease of the Colon01:27

Diverticular Disease of the Colon

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

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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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...
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Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection
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Interval colorectal cancer after colonoscopy.

James M Richter1, Emily J Campbell1, Daniel C Chung1

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Older patients and right-sided colon cancers pose a higher risk for interval colorectal cancer after screening colonoscopy. Careful examination of the right colon is crucial for early detection.

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Area of Science:

  • Gastroenterology
  • Oncology
  • Preventive Medicine

Background:

  • Colorectal cancer (CRC) screening via colonoscopy is common.
  • A subset of patients develop interval cancers after a negative screening colonoscopy.

Purpose of the Study:

  • To identify clinical and endoscopic factors predicting interval colorectal cancer risk.
  • To improve early detection rates of colorectal cancer.

Main Methods:

  • Retrospective review of 75,314 adult screening/diagnostic colonoscopies (1998-2006).
  • Identification of 77 patients who developed interval cancers within 5 years.
  • Analysis of original endoscopic findings for risk predictors.

Main Results:

  • Patients aged 60 years and older had a significantly higher risk of interval neoplasms (P < .0001).
  • Interval cancers were more frequently located in the right colon and hepatic flexure (P < .0001).
  • Examination completion rates impacted interval cancer rates (P = .016), but poor bowel preparation did not (P = .799).

Conclusions:

  • Identifying high-risk patients and ensuring follow-up are vital for early-stage cancer discovery.
  • Thorough examination of the right colon is essential during screening colonoscopy.