AIM STEP 10
Student Memory Support
Gastric Polyps, Gastric Cancer and Gastric Outlet Obstruction
4th Year MBBS • GIT Module • High-yield memory reinforcement and last-minute revision. :contentReference[oaicite:0]{index=0}
1. High-Yield Flashcards
Tap each question to reveal the answer.
Which three major epithelial gastric polyps are important for undergraduate classification?
Fundic gland polyps, hyperplastic polyps and gastric adenomas.
What microscopic feature characterizes a fundic gland polyp?
Cystically dilated fundic glands lined by relatively bland epithelium.
What basic process produces most hyperplastic gastric polyps?
Exaggerated regeneration following chronic gastric mucosal injury or inflammation.
Which gastric polyp is a true dysplastic epithelial neoplasm with definite malignant potential?
Gastric adenoma.
What is the typical pathological sequence leading to intestinal-type gastric adenocarcinoma?
Chronic gastritis → atrophy → intestinal metaplasia → dysplasia → adenocarcinoma.
Loss of which adhesion molecule is strongly associated with diffuse gastric carcinoma?
E-cadherin.
What microscopic cell is a characteristic clue to diffuse gastric carcinoma?
Signet-ring cell.
What is linitis plastica?
Diffuse malignant infiltration producing a thick, rigid and poorly distensible stomach.
What investigation definitively confirms gastric carcinoma?
Endoscopic biopsy followed by histopathological examination.
How is early gastric carcinoma defined according to depth?
Carcinoma confined to the mucosa and/or submucosa, irrespective of regional lymph-node involvement.
What is the main surgical principle for resectable invasive gastric carcinoma?
Oncological gastric resection with appropriate regional lymph-node removal.
Why is vomiting in gastric outlet obstruction commonly non-bilious?
The obstruction is typically proximal to the point where bile enters the duodenum.
What classic biochemical pattern may follow prolonged vomiting from gastric outlet obstruction?
Hypochloremic, hypokalemic metabolic alkalosis.
What must be corrected before definitive intervention for severe gastric outlet obstruction when clinically possible?
Dehydration, circulating volume depletion and electrolyte/acid-base abnormalities.
2. Mnemonics
Mnemonic Title: Major Gastric Polyp Types
FHA
Meaning: Fundic gland polyp • Hyperplastic polyp • gastric Adenoma.
Mnemonic Title: Intestinal-Type Progression
G-A-M-D-C
Meaning: Gastritis → Atrophy → intestinal Metaplasia → Dysplasia → Carcinoma.
Mnemonic Title: Gastric Outlet Stabilization
D-FEN
Meaning: Decompress when required • give Fluids • correct Electrolytes • support Nutrition.
3. Memory Tables
Intestinal-Type vs Diffuse Gastric Adenocarcinoma
| Feature | Intestinal Type | Diffuse Type |
|---|---|---|
| Background pathway | Atrophy → metaplasia → dysplasia | Loss of cell adhesion |
| Cell pattern | Cohesive malignant glands | Poorly cohesive cells |
| Key microscopic clue | Gland formation | Signet-ring cells may occur |
| Gross tendency | Mass-forming or ulcerative | Diffuse wall infiltration |
| Memory clue | Precursor mucosal changes | Linitis plastica |
4. Rapid Revision Points — Last-Minute RevisionMust Remember:
- Fundic gland polyps show cystically dilated glands and commonly arise in the body and fundus.
- Hyperplastic polyps reflect repeated mucosal injury and regenerative foveolar hyperplasia.
- Gastric adenoma contains dysplastic epithelium and has meaningful malignant potential.
- Chronic gastritis with atrophy and intestinal metaplasia provides a background for intestinal-type carcinoma.
- Diffuse carcinoma is linked to impaired cell adhesion and may contain signet-ring cells.
- Linitis plastica means diffuse infiltration producing a rigid, poorly distensible stomach.
- Endoscopy identifies a suspicious lesion; biopsy histology confirms gastric carcinoma.
- Tumor spread may occur by direct extension, lymphatics, bloodstream or peritoneal dissemination.
- Gastric outlet obstruction causes retained food, early satiety, distension and recurrent vomiting.
- Severe obstruction requires fluid, electrolyte and nutritional stabilization before definitive treatment when possible.
KMU Trap: Early gastric carcinoma is defined by invasion limited to the mucosa and/or submucosa, not by absence of regional lymph-node involvement.
5. Clinical Memory Hooks
Long-standing gastritis with intestinal metaplasia
→
think progression toward intestinal-type gastric adenocarcinoma.
→
think progression toward intestinal-type gastric adenocarcinoma.
Rigid, poorly distensible stomach
→
think diffuse gastric infiltration producing linitis plastica.
→
think diffuse gastric infiltration producing linitis plastica.
Weight loss + ulcerated gastric lesion + iron deficiency
→
chronic tumor bleeding causing iron-deficiency anemia.
→
chronic tumor bleeding causing iron-deficiency anemia.
Early satiety + old food vomiting + dehydration
→
gastric outlet obstruction with retained gastric contents and metabolic disturbance.
→
gastric outlet obstruction with retained gastric contents and metabolic disturbance.
6. Starred High-Yield Exam Points
- ⭐ Gastric adenoma = dysplastic epithelial neoplasm with malignant potential.
- ⭐ Intestinal-type pathway: chronic gastritis → atrophy → intestinal metaplasia → dysplasia → carcinoma.
- ⭐ Diffuse gastric carcinoma: impaired E-cadherin-mediated adhesion → poorly cohesive cells → possible signet-ring morphology.
- ⭐ Definitive diagnosis of gastric carcinoma requires endoscopic biopsy and histopathology.
- ⭐ Persistent gastric outlet vomiting may produce hypochloremic, hypokalemic metabolic alkalosis.
- ⭐ Severe gastric outlet obstruction: restore fluid and electrolyte balance before definitive intervention whenever clinically possible.