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Answer 2md mbbs pathology
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esophageal carcinoma
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esophageal cancer risk factors pathology gross microscopic features
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a) Most probable diagnosis
Carcinoma of esophagus, most likely squamous cell carcinoma (SCC).
Progressive dysphagia, initially for solids and later for liquids, with weight loss indicates a progressively obstructing esophageal malignancy. SCC commonly occurs in the middle third of the esophagus.
Robbins & Kumar Basic Pathology, p. 550.
Robbins & Kumar Basic Pathology, p. 550.
b) Risk factors
- Tobacco smoking and alcohol consumption - act synergistically.
- Chronic mucosal injury:
- Caustic esophageal stricture
- Achalasia
- Plummer-Vinson syndrome
- Frequent intake of very hot beverages
- Previous mediastinal irradiation
- Nutritional deficiency and dietary carcinogens such as nitrosamines.
- HPV infection in some high-risk regions.
Robbins & Kumar Basic Pathology, p. 550.
c) Gross and microscopic features
Gross morphology
- Usually located in the middle third of esophagus.
- Initially: small, gray-white plaque-like mucosal thickening.
- Later may form:
- Polypoidal/exophytic mass projecting into the lumen
- Ulcerative lesion
- Diffusely infiltrative growth
- Causes wall thickening, rigidity, stricture, and narrowing of lumen.
Microscopy
- Invasive squamous cell carcinoma, usually moderately or well differentiated.
- Nests and cords of malignant squamous cells infiltrate the wall.
- Shows pleomorphism, hyperchromatic nuclei, mitotic activity, and intercellular bridges.
- Keratin pearl formation may be present in well-differentiated tumors.
- Adjacent epithelium may show squamous dysplasia/carcinoma in situ.
Robbins & Kumar Basic Pathology, p. 550.
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Helicobacter pylori peptic ulcer
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Helicobacter pylori peptic ulcer disease pathogenesis gastric versus duodenal ulcer pathology
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1. Diagnosis and supporting findings
Diagnosis: Peptic ulcer disease (PUD), likely an H. pylori-associated gastric ulcer, with frequent NSAID use as an additional cause.
Findings supporting diagnosis:
- Burning epigastric pain, worsened after meals.
- Epigastric tenderness, nausea, and bloating.
- Frequent NSAID intake, which damages gastric mucosal protection.
- Positive urea breath test confirms active H. pylori infection.
2. Pathogenesis of H. pylori-induced peptic ulcer
H. pylori causes ulceration by disturbing the balance between mucosal defence and acid-peptic injury:
-
Colonisation of gastric mucus
- The organism is motile and penetrates the gastric mucus layer.
- It adheres to surface epithelial cells.
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Urease production
- Urease converts urea into ammonia and carbon dioxide.
- Ammonia helps the organism survive in acid but is directly toxic to epithelial cells.
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Mucosal epithelial injury
- Bacterial products such as mucinase, phospholipase, VacA cytotoxin, and CagA damage surface epithelium and weaken the mucus-bicarbonate barrier.
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Chronic inflammation
- H. pylori induces chronic active gastritis with neutrophils, lymphocytes, plasma cells, and macrophages.
- Cytokines and inflammatory mediators cause further epithelial damage.
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Increased acid secretion in antral-predominant gastritis
- Decreased somatostatin from D cells causes increased gastrin secretion.
- Increased gastric acid enters the duodenum, producing gastric metaplasia in the duodenum, which can be colonised by H. pylori and ulcerate.
NSAIDs aggravate ulcer formation by inhibiting cyclooxygenase, reducing prostaglandins, mucus and bicarbonate secretion, mucosal blood flow, and epithelial repair.
Robbins & Kumar Basic Pathology, p. 550.
3. Differences between gastric and duodenal ulcers
| Feature | Gastric ulcer | Duodenal ulcer |
|---|---|---|
| Usual site | Lesser curvature of stomach, usually near incisura angularis | First part of duodenum, usually anterior wall of duodenal bulb |
| Pain relation to meals | Pain occurs soon after meals, typically worsened by eating | Pain occurs 2-3 hours after meals and at night; relieved by food or antacids |
| Effect on body weight | Weight loss is common because patient avoids food | Weight may be normal or increased because food relieves pain |
| Acid secretion | Normal or decreased, except prepyloric ulcers | Often increased acid secretion |
| Main pathogenetic factor | Defective mucosal defence, H. pylori, NSAIDs | Increased acid-peptic injury, H. pylori-associated antral gastritis |
| Age group | Usually older patients | Usually younger patients |
| Malignancy | May be malignant or mimic carcinoma, so biopsy is required | Almost always benign |
| Common complication | Hemorrhage | Perforation, especially anterior-wall ulcer; posterior ulcer may bleed by eroding gastroduodenal artery |
Note: The post-meal worsening suggests a gastric ulcer, while relief after food is classically seen in duodenal ulcer. Overall, this case is best labelled H. pylori-positive peptic ulcer disease with NSAID-associated mucosal injury.
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