Gastric histopathology 2025

What are the different layers of the stomach wall?

The stomach wall is composed of mucosa, submucosa, muscularis propria, and serosa.

Define acute gastritis.

Acute gastritis is an acute mucosal inflammatory process, often accompanied by hemorrhage and erosion.

What major factors are associated with the pathogenesis of acute gastritis?

Heavy use of NSAIDs, excessive alcohol, smoking, severe stress, systemic infections, and trauma.

What is the definition of gastritis?

Gastritis is defined as inflammation of the gastric mucosa.

What is the role of mucus in gastric protection?

Mucin secreted by surface foveolar cells provides a protective barrier against acid.

What is chronic gastritis?

Chronic gastritis involves the presence of chronic mucosal inflammatory changes leading to mucosal atrophy.

What are the histological features of chronic gastritis?

An inflammatory infiltrate of lymphocytes and plasma cells, regenerative change, metaplasia, and atrophy.

Which infection is a major etiological factor in chronic gastritis?

Chronic infection by H. pylori.

What is the primary difference between acute and chronic gastritis in terms of mucosal changes?

Acute gastritis has transient inflammation while chronic gastritis leads to mucosal atrophy.

What is peptic ulcer disease?

Peptic ulcer disease refers to ulcers that breach the mucosa of the alimentary tract extending into the submucosa or deeper.

What role does H. pylori play in peptic ulcer disease?

H. pylori infection is a major factor in the pathogenesis of peptic ulcer disease.

What are some common sites of peptic ulcers?

Stomach (usually antrum), duodenum, and gastroesophageal junction.

What are the stages of peptic ulcers?

Active stages (A1, A2), healing stages (H1, H2), and scar stages (S1, S2).

What is hypertrophic gastropathy?

A group of uncommon conditions characterized by giant cerebriform enlargement of the rugal folds of the gastric mucosa.

What causes the rugal enlargement in hypertrophic gastropathy?

Hyperplasia of the mucosal epithelial cells without inflammation.

What is Ménétrier disease?

A condition resulting from profound hyperplasia of surface mucous cells with accompanying glandular atrophy.

List some complications of peptic ulcer disease.

Bleeding, perforation, obstruction, and acute gastric ulceration.

How is the morphology of active ulcers typically characterized?

Active ulcers exhibit zones of necrosis, non-specific inflammatory infiltrates, and granulation tissue.

What is the primary histological feature of gastric ulcers?

A round to oval, sharply punched-out defect with a level margin with surrounding mucosa.

Which cells primarily secrete acid in the gastric glands?

Parietal (oxyntic) cells primarily secrete acid.

What key feature differentiates neck mucous cells from surface mucous cells?

Neck mucous cells are located between parietal cells in gastric glands.

What changes occur in the gastric mucosa in response to chronic H. pylori infection?

Mucosal damage, increased inflammation, and potential for metaplasia.

When do mucus-secreting pyloric glands primarily secrete mucous?

During digestion to protect the gastric mucosa and aid in food processing.

What is the appearance of the gastric mucosa with acute gastritis?

Hyperemic with infiltration by neutrophils.

How often does the surface epithelial layer of the stomach replace itself?

Every 3 to 7 days.

What role do prostaglandins play in gastric protection?

They help maintain the integrity of the gastric mucosa.

Describe the transitional epithelium at the gastro-oesophageal junction.

It transitions from stratified squamous epithelium to glandular columnar mucosa.

What are the effects of prolonged NSAID use on the gastric mucosa?

It can lead to mucosal defects like acute gastric ulcers.

What type of cells are predominant in chronic gastritis associated with H. pylori infection?

Lymphocytes and plasma cells.

List the histologic features characteristic of H. pylori gastritis.

Neutrophilic infiltrates, lymphoid aggregates with germinal centers, and subepithelial plasma cells.

What complications can arise from untreated peptic ulcers?

Bleeding, perforation, and obstruction.

Define the healing process of a peptic ulcer.

Involves maturation of granulation tissue and re-epithelialization.

What is the significance of the gastric pits in the gastric mucosa?

They are openings where gastric glands secrete gastric juices.

What is the characteristic appearance of a peptic ulcer upon gross inspection?

Sharply punched-out defect with possibly overhanging margins.

What is acute erosive hemorrhagic gastritis?

Concurrent erosion and hemorrhage in the gastric mucosa.

What factors can lead to stress ulcers?

Severe physiologic stress, such as trauma or burns.

Describe the major types of cells found in gastric glands.

Surface mucous cells, neck mucous cells, parietal cells, peptic cells, and stem cells.

What causes the characteristic 'fried egg appearance' of parietal cells?

Their copious eosinophilic cytoplasm and central nucleus.

How does the gastric mucosa protect itself against acid damage?

Through the secretion of mucus and bicarbonate, and by maintaining a tight epithelial barrier.

What happens in the gastric mucosa during acute gastritis?

There is edema, slight vascular congestion, and infiltrates of neutrophils.

What is the anatomical significance of the muscularis propria at the gastro-oesophageal junction?

It acts as a physiological sphincter mechanism.

How does excessive alcohol consumption affect the gastric mucosa?

It can lead to acute gastritis and mucosal damage.

What is the histological effect of chronic gastritis?

Chronic inflammation, atrophy, possible intestinal metaplasia, and dysplasia.

What is the clinical relevance of hypertrophic gastropathy?

It can mimic infiltrative carcinoma or lymphoma on imaging.

Define gastric ulceration type. A characteristic feature of mucosal defects.

Mucosal defects may be focal and acutely developing, often following NSAID therapy.

What is the effect of gastric banding on histology?

It can lead to changes in the mucosal structure and increased acid secretion.