Stomach Pathology

From Ulceration to Carcinoma

• Ulcers form due to defects in the mucosa.
• Ulcer means necrosis and inflammation in the mucosa.
• If ulcers are not treated, they can turn into carcinoma.

Causes of Ulcers

• H. pylori: A bacterium that damages the mucosa.
• Use of NSAIDs: Inhibit cyclooxygenase, which eliminates the stomach's protective role.

Common Sites of Ulcers

• Most common site: the first part of the duodenum.
• Other sites: Antral region of the stomach and esophagus.

Epidemiology

• In the UK, 10% in men, 4% in women.
• Worldwide 3 million people affected.

Pathogenesis

• Main Causes: H. pylori and NSAIDs.
• Causes of Hyperacidity:
  • Increased acid secretion by H. pylori.
  • Hyperplasia of parietal cells.
  • Increased vagal stimulation.
  • Zollinger-Ellison syndrome.

Morphology of Ulcers

• Usually solitary, if up to 0.3 cm, they are shallow.
• Deeper if more than 0.6 cm.

Complications

• Bleeding: Internal bleeding leading to anemia.
• Perforation: Can perforate up to the pancreas.
• Obstruction: Narrowing of the lumen.

Clinical Presentation

• Chronic history, recurrent.
• Pain is more at night, relieved by eating.

Treatment

• Treatment of H. pylori with antimicrobial agents.
• Antacids for acid neutralization.
• Surgery in case of perforation.

Additional Terms

• Mucosal Atrophy: Decrease in cells of the mucosa.
• Intestinal Metaplasia: Transformation of mucosal cells.

These notes provide a summary of all important information related to stomach pathology and ulcers.