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Related Concept Videos

Gastritis II: Pathophysiology01:26

Gastritis II: Pathophysiology

The pathophysiology of gastritis begins with the colonization of the stomach lining by Helicobacter pylori (H. pylori). This bacterium spreads mainly via the oral-oral route through saliva or shared utensils, and can also be transmitted in overcrowded or unhygienic environments through contaminated water, despite its brief survival outside the body.ColonizationOnce ingested, H. pylori enters the stomach and begins colonization by navigating through the mucus layer lining the stomach wall. It...
Gastritis-I: Introduction and Types01:27

Gastritis-I: Introduction and Types

Gastritis, defined by the inflammation or irritation of the stomach lining or gastric mucosa, manifests in several distinct forms: acute, chronic, reactive, and a specific subtype known as autoimmune metaplastic atrophic gastritis.
Acute gastritis presents as a sudden inflammation triggered by various stressors to the stomach lining, such as exposure to corrosive agents, local irritants like aspirin and other NSAIDs, alcohol consumption, radiation therapy, physical trauma, severe burns, sepsis,...
Pyloric Obstruction01:11

Pyloric Obstruction

Pyloric obstruction, also referred to as gastric outlet obstruction, is a condition characterized by narrowing or blockage at the pylorus—the muscular valve regulating the flow of stomach contents into the duodenum. When this passage becomes impaired, the stomach cannot effectively empty its contents into the small intestine. This disruption leads to a range of gastrointestinal symptoms, including early satiety, bloating, epigastric pain, postprandial nausea, persistent vomiting, and...
Barrett Esophagus-I: Introduction01:21

Barrett Esophagus-I: Introduction

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 similar...
Hormones Secreted by the Stomach01:25

Hormones Secreted by the Stomach

Enteroendocrine cells, accounting for only 1% of stomach epithelial cells, play a significant role in digestion and are classified by their digestive hormone secretions.
Each of these hormones secreted by different enteroendocrine cells plays a unique role in digestion. Here are a few examples:
Chemotherapy-Induced Nausea and Vomiting: Neurokinin-1 Receptor Antagonists01:28

Chemotherapy-Induced Nausea and Vomiting: Neurokinin-1 Receptor Antagonists

Neurokinin 1 (NK1) receptors are distributed across the GI tract, vagal afferents, and key CNS regions including the central vomiting center and chemoreceptor trigger zone (CTZ) Chemotherapy agents stimulate enterochromaffin cells in the gastrointestinal (GI) tract to release large amounts of substance P (SP). SP is a neuropeptide released by specific sensory nerves in response to many different stressors, including those in the GI mucosa affected by chemotherapy.  SP binds and activates these...

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Related Experiment Video

Updated: Jun 1, 2026

Intraoperative Gastroscopy for Tumor Localization in Laparoscopic Surgery for Gastric Adenocarcinoma
10:31

Intraoperative Gastroscopy for Tumor Localization in Laparoscopic Surgery for Gastric Adenocarcinoma

Published on: August 9, 2016

Gastric carcinoid tumors.

Russell Wardlaw1, James W Smith

  • 1Department of Gastroenterology, Ochsner Clinic Foundation, New Orleans, LA.

Ochsner Journal
|May 24, 2011
PubMed
Summary
This summary is machine-generated.

Gastric carcinoid tumors are classified into three types based on their cause. Treatment for these tumors depends on their type, size, and whether they have spread.

Keywords:
GEP-NETsGastric carcinoidZollinger-Ellison syndromechronic atrophic gastritishypergastrinemiamultiple endocrine neoplasia (MEN) type 1pernicious anemiasomatostatinsomatostatin receptor scintigraphy

Related Experiment Videos

Last Updated: Jun 1, 2026

Intraoperative Gastroscopy for Tumor Localization in Laparoscopic Surgery for Gastric Adenocarcinoma
10:31

Intraoperative Gastroscopy for Tumor Localization in Laparoscopic Surgery for Gastric Adenocarcinoma

Published on: August 9, 2016

Area of Science:

  • Gastroenterology
  • Oncology
  • Endocrinology

Background:

  • Gastric carcinoid tumors (GCTs) were initially considered benign but have a complex classification.
  • Understanding GCT pathophysiology is crucial for diagnosis and treatment.
  • Three distinct types of GCTs are recognized, each with unique characteristics.

Purpose of the Study:

  • To elucidate the distinct pathophysiological mechanisms of the three types of gastric carcinoid tumors.
  • To differentiate GCT types based on clinical presentation, associated conditions, and metastatic potential.
  • To inform treatment strategies based on GCT classification.

Main Methods:

  • Review of existing literature on gastric carcinoid tumor classification and pathophysiology.
  • Analysis of clinical features, including lesion characteristics, hormonal associations (e.g., hypergastrinemia), and genetic syndromes (e.g., MEN1).
  • Comparison of metastatic potential and carcinoid syndrome presentation across GCT types.

Main Results:

  • Type 1 GCTs (70-80%) are associated with hypergastrinemia due to atrophic gastritis/pernicious anemia, typically present as multiple small lesions, and have low metastatic risk.
  • Type 2 GCTs (5%) are linked to Zollinger-Ellison syndrome and MEN1, presenting as multiple small lesions with a slightly higher but gastrinoma-dependent metastatic risk.
  • Type 3 GCTs (20%) are sporadic, present as large solitary lesions, are often metastatic at diagnosis, and may cause atypical carcinoid syndrome possibly mediated by histamine.

Conclusions:

  • Gastric carcinoid tumors exhibit distinct pathophysiological subtypes (Type 1, 2, and 3) with varying clinical behaviors.
  • Accurate classification is essential for predicting prognosis and guiding appropriate medical, endoscopic, or surgical management.
  • Understanding the specific type, size, and metastatic status is critical for effective GCT treatment planning.