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Related Concept Videos

Esophagus01:24

Esophagus

4.2K
The esophagus, a muscular conduit linking the pharynx and stomach, measures roughly 10 inches (25.4 cm) and sits behind the trachea. It remains collapsed when not swallowing. The esophagus follows a predominantly straight path through the thoracic mediastinum and enters the abdominal cavity through a diaphragmatic opening known as the esophageal hiatus.
The movement of edibles from the pharynx into the esophagus is facilitated by the upper esophageal sphincter, which is formed primarily by the...
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Gastric Phase of Digestion01:26

Gastric Phase of Digestion

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The gastric phase of digestion begins as soon as food enters the stomach. The incoming food bolus triggers neural and hormonal mechanisms, which last approximately 3 to 4 hours. During this phase, the stomach undergoes significant changes to prepare the food for further digestion and absorption.
When food enters the stomach, it stretches the stomach walls and activates stretch receptors. This triggers local reflexes of the enteric nervous system, mediated through the myenteric plexus. These...
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Barrett Esophagus-I: Introduction01:21

Barrett Esophagus-I: Introduction

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Barrett's esophagus is a medical condition where the esophageal mucosa is significantly damaged by stomach acid or other digestive fluids, often due to long-term exposure associated with gastroesophageal reflux disease (GERD). In GERD, a weakened or abnormally relaxed lower esophageal sphincter allows stomach acid to flow persistently into the esophagus.
This constant acid exposure transforms the esophagus's pink mucosal lining (stratified squamous epithelium) into a type of lining more...
1.0K
Esophageal Strictures-I: Introduction01:30

Esophageal Strictures-I: Introduction

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Esophageal strictures involve abnormal narrowing or tightening of the esophagus. They vary in length and severity, ranging from mild constriction to complete obstruction, and are classified as benign (noncancerous) or malignant (cancerous).
Etiology
The primary cause of esophageal strictures is long-standing gastroesophageal reflux disease (GERD), accounting for about 70 to 80% of adult cases. Chronic acid reflux can lead to injury and scarring of the esophageal lining, culminating in...
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Gastric Motility01:16

Gastric Motility

3.7K
Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
Peristaltic Waves and Chyme Formation
Upon food entry, the stomach initiates...
3.7K
Gastroesophageal Reflux Disease I: Meaning and Pathophysiology01:29

Gastroesophageal Reflux Disease I: Meaning and Pathophysiology

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Gastroesophageal Reflux Disease (GERD) involves the recurrent backflow of the stomach or duodenal contents into the esophagus, leading to troublesome symptoms and potential esophageal mucosal damage. Although GERD is often referred to as a disease, it is more accurately described as a syndrome, as it encompasses a range of symptoms and complications rather than a singular pathological entity, impacting a large number of individuals as the most prevalent upper gastrointestinal problem. Roughly...
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Related Experiment Video

Updated: Mar 3, 2026

Author Spotlight: Point-of-Care Ultrasound for Gastric Content Assessment and Risk Stratification in Perioperative Care
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Considering the esophagogastric junction as a 'zone'.

Shin Ichihara1, Noriya Uedo2, Takuji Gotoda3

  • 1Department of Surgical Pathology, Sapporo Kosei General Hospital, Sapporo, Japan.

Digestive Endoscopy : Official Journal of the Japan Gastroenterological Endoscopy Society
|April 21, 2017
PubMed
Summary

Siewert

Keywords:
adenocarcinomabarrett's esophagusesophageal neoplasmesophagogastric junctiongastric neoplasm

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Area of Science:

  • Gastroenterology and Surgical Oncology
  • Tumor Classification and Etiology

Background:

  • Siewert's classification defines Type II tumors (cardia cancers) anatomically within 1 cm proximal to 2 cm distal of the esophagogastric junction (EGJ).
  • The EGJ zone, histologically distinct, is implicated in adenocarcinoma development.
  • Current TNM classification groups EGJ adenocarcinoma (EGJAC) with esophageal adenocarcinoma (EAC), despite differing behaviors.

Purpose of the Study:

  • To review the current understanding of esophagogastric junction adenocarcinoma (EGJAC) classification and etiology.
  • To highlight the distinct clinical behavior of EGJAC compared to esophageal and gastric adenocarcinomas.
  • To address the lack of clinical relevance in subdividing EGJ zone adenocarcinoma based on its precise location relative to the EGJ.

Main Methods:

  • Review of existing literature on Siewert's classification and EGJ adenocarcinoma.
  • Analysis of histological findings defining the EGJ zone.
  • Discussion of etiological factors including Barrett's esophagus.

Main Results:

  • EGJAC exhibits distinct behavior from both EAC and gastric carcinoma.
  • Barrett's esophagus is a significant etiological factor for EGJAC.
  • No current clinical basis exists to differentiate EGJAC arising above or below the anatomical EGJ line.

Conclusions:

  • Subdivision of EGJ adenocarcinoma based on location relative to the EGJ line lacks clinical relevance.
  • Further research is needed to differentiate EGJAC arising from short-segment Barrett's esophagus versus gastric cardia.
  • EGJAC represents a unique entity requiring specific consideration in classification and treatment.