📋 What's Inside the Notes

1. Barrett's Esophagus

• Simple definition, cause (GERD), gross + microscopic appearance
• Key exam point: Goblet cells = must for diagnosis → risk of adenocarcinoma

2. Stomach — Key Definitions

• Erosion vs. Ulcer vs. Gastritis vs. Gastropathy (clear table)

3. Gastritis

• Acute vs. Chronic, Type A (Autoimmune) vs. Type B (H. pylori)
• H. pylori facts — urease, diagnosis methods

4. Peptic Ulcer Disease

• Damaging vs. Defensive forces table
• 4 microscopic zones of ulcer
• Clinical features + complications (bleeding, perforation, obstruction)
• Full comparison table: Gastric Ulcer vs. Duodenal Ulcer

5. Gastric Carcinoma

• Risk factors (environmental + genetic + protective)
• H. pylori → carcinoma sequence
• Lauren classification: Intestinal vs. Diffuse type (with Linitis Plastica + Signet-ring cells)
• Early gastric cancer definition

6. Ulcerative Colitis

• Continuous from rectum, mucosa only, pseudopolyps, crypt abscess
• UC vs. Crohn's comparison table

7. Colorectal Carcinoma

• Right vs. left sided presentation
• "Dirty necrosis" hallmark, investigations (CEA, biopsy)

8. Viral Hepatitis

• All 5 viruses (A–E), HBV = only DNA virus
• HCV = most chronic, HDV = needs HBV

⭐ Quick Revision Section

• All high-yield one-liners in one place at the end