AIM CONCEPT INTEGRATION
4th Year MBBS
GIT Module
4th Year MBBS
GIT Module
Gastric Polyps, Gastric Cancer and Gastric Outlet Obstruction
Connect the pathological progression, clinical consequences, diagnostic clues and surgical management into one rapid-revision framework. :contentReference[oaicite:0]{index=0}
1. THE TOPIC IN ONE CONNECTED FLOW
Gastric polyps range from reactive lesions to true dysplastic neoplasms, while gastric adenocarcinoma develops through intestinal or diffuse pathways. As malignant disease progresses, invasion may cause bleeding, metastasis or gastric outlet obstruction. Diagnosis links endoscopy and histology with assessment of disease extent, while treatment depends on cause, depth and resectability.
Risk / Mucosal Injury
Chronic gastritis, atrophy, smoking, dietary factors or inherited predisposition
Chronic gastritis, atrophy, smoking, dietary factors or inherited predisposition
→
Mucosal Change
Regeneration may form hyperplastic polyps; dysplasia may form adenomas
Regeneration may form hyperplastic polyps; dysplasia may form adenomas
→
Cancer Pathway
Metaplasia → dysplasia → intestinal type, or loss of cell adhesion → diffuse type
Metaplasia → dysplasia → intestinal type, or loss of cell adhesion → diffuse type
→
Growth & Invasion
Mass, ulceration or diffuse wall infiltration with possible lymphatic, blood or peritoneal spread
Mass, ulceration or diffuse wall infiltration with possible lymphatic, blood or peritoneal spread
→
Clinical Consequence
Weight loss, chronic bleeding, anemia, reduced intake or distal obstruction
Weight loss, chronic bleeding, anemia, reduced intake or distal obstruction
→
Diagnostic Link
Endoscopy → biopsy histology → imaging to assess extent or external compression
Endoscopy → biopsy histology → imaging to assess extent or external compression
→
Management / Outcome
Endoscopic treatment, oncological resection or symptom-directed palliation according to disease extent
Endoscopic treatment, oncological resection or symptom-directed palliation according to disease extent
Outlet-obstruction branch:
Peptic-ulcer scarring or distal malignancy
→
impaired gastric emptying
→
retained food and vomiting
→
dehydration with chloride, hydrogen and potassium loss
→
physiological stabilization
→
cause-directed relief of obstruction
→
impaired gastric emptying
→
retained food and vomiting
→
dehydration with chloride, hydrogen and potassium loss
→
physiological stabilization
→
cause-directed relief of obstruction
2. KEY CLINICAL CONNECTIONS
Morphology → Behaviour
Malignant gland formation
→
intestinal-type carcinoma
→
commonly linked with precursor atrophy, metaplasia and dysplasia.
→
intestinal-type carcinoma
→
commonly linked with precursor atrophy, metaplasia and dysplasia.
Poorly cohesive cells
→
diffuse infiltration
→
rigid linitis plastica pattern.
→
diffuse infiltration
→
rigid linitis plastica pattern.
Suspicious Lesion → Diagnosis
Gastric mass or ulcer
→
endoscopic visualization
→
biopsy
→
histological confirmation.
→
endoscopic visualization
→
biopsy
→
histological confirmation.
Confirmed carcinoma
→
imaging of local and distant extent
→
resectability and treatment planning.
→
imaging of local and distant extent
→
resectability and treatment planning.
Obstruction → Physiological Consequence
Outlet narrowing
→
gastric retention
→
early satiety, distension and non-bilious vomiting.
→
gastric retention
→
early satiety, distension and non-bilious vomiting.
Repeated vomiting
→
volume and acid loss
→
hypochloremic, hypokalemic metabolic alkalosis
→
correct first, then treat the cause.
→
volume and acid loss
→
hypochloremic, hypokalemic metabolic alkalosis
→
correct first, then treat the cause.
3. AIM HIGH-YIELD INTEGRATION REVIEW
⭐ Chronic mucosal injury
→ regeneration or metaplastic change →
hyperplastic polyps or progression toward intestinal-type carcinoma.
→ regeneration or metaplastic change →
hyperplastic polyps or progression toward intestinal-type carcinoma.
Gastric adenoma
→ epithelial dysplasia →
greater malignant potential than ordinary reactive polyps.
→ epithelial dysplasia →
greater malignant potential than ordinary reactive polyps.
⭐ Loss of effective E-cadherin-mediated adhesion
→ discohesive cells →
diffuse infiltration with possible signet-ring morphology and linitis plastica.
→ discohesive cells →
diffuse infiltration with possible signet-ring morphology and linitis plastica.
Tumor ulceration
→ chronic blood loss →
iron-deficiency anemia and fatigue.
→ chronic blood loss →
iron-deficiency anemia and fatigue.
⭐ Suspicious gastric lesion
→ endoscopic biopsy →
histological confirmation; imaging then defines disease extent.
→ endoscopic biopsy →
histological confirmation; imaging then defines disease extent.
Distal gastric cancer or benign pyloric scarring
→ gastric outlet narrowing →
retained contents, vomiting and progressive nutritional compromise.
→ gastric outlet narrowing →
retained contents, vomiting and progressive nutritional compromise.
⭐ Persistent gastric vomiting
→ H+, Cl− and volume loss →
metabolic alkalosis, hypokalemia and dehydration requiring correction before definitive intervention.
→ H+, Cl− and volume loss →
metabolic alkalosis, hypokalemia and dehydration requiring correction before definitive intervention.
Disease extent
→ treatment intent →
selected superficial lesions may receive endoscopic treatment, resectable invasive cancer requires oncological surgery, and unresectable obstruction may need palliation.
→ treatment intent →
selected superficial lesions may receive endoscopic treatment, resectable invasive cancer requires oncological surgery, and unresectable obstruction may need palliation.
AIM Exam Trap:
Early gastric carcinoma is defined by invasion limited to the mucosa and/or submucosa; regional lymph-node involvement does not by itself convert it into advanced gastric carcinoma.
Early gastric carcinoma is defined by invasion limited to the mucosa and/or submucosa; regional lymph-node involvement does not by itself convert it into advanced gastric carcinoma.