60-year-old shipyard worker presents with reduced thoracic expansion and dyspnea. History reveals prolonged asbestos exposure. Which diagnosis is most likely? A. Tuberculosis B. / Mesothelioma Bronchogenic carcinoma D. Silicosis
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asbestos exposure mesothelioma pleural disease reduced thoracic expansion dyspnea
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asbestosis occupational lung disease silicosis tuberculosis differential diagnosis
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Answer: B. Mesothelioma
The most likely diagnosis is malignant mesothelioma.
Why Mesothelioma?
According to Harrison's Principles of Internal Medicine (p. 8090):
"Malignant mesotheliomas are primary tumors that arise from the mesothelial cells lining the pleural cavities; most are related to asbestos exposure. Patients present with chest pain and shortness of breath. The chest radiograph reveals pleural effusion, generalized pleural thickening, and a shrunken hemithorax."
The clinical triad in this question maps perfectly:
| Feature | This Patient | Mesothelioma |
|---|---|---|
| Occupation | Shipyard worker | Classic high-risk occupation (asbestos use in ships) |
| Exposure | Prolonged asbestos | Primary etiologic factor |
| Reduced thoracic expansion | ✓ | Due to pleural thickening/shrunken hemithorax |
| Dyspnea | ✓ | Due to pleural effusion and restricted lung expansion |
Why Not the Others?
| Option | Reasoning |
|---|---|
| A. Tuberculosis | Not linked to asbestos exposure; fever, night sweats, weight loss would dominate; no occupational correlation |
| C. Bronchogenic carcinoma | Asbestos does increase lung cancer risk, but the hallmark signs here (reduced thoracic expansion from pleural thickening, shrunken hemithorax) point more specifically to mesothelioma |
| D. Silicosis | Caused by silica dust exposure (mining, sandblasting), not asbestos; shipyard workers are classically exposed to asbestos, not silica |
Key Teaching Point
Asbestos exposure causes a spectrum of diseases:
- Asbestosis — diffuse interstitial pulmonary fibrosis (requires ≥10 years exposure; Harrison's p. 7975)
- Pleural plaques — most common benign manifestation
- Mesothelioma — malignant pleural tumor; latency period typically 20–40 years
- Bronchogenic carcinoma — risk is multiplicative with smoking
The combination of shipyard work + prolonged asbestos exposure + pleural restriction + dyspnea is the classic textbook presentation of mesothelioma.
Patient with high grade fever, low Hb, chills, splenomegaly, raised IgM. Diagnosis? A. CML Brucellosis Leishmaniasis D. Malaria
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malaria fever chills splenomegaly anemia low hemoglobin raised IgM diagnosis
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brucellosis leishmaniasis CML splenomegaly fever differential diagnosis
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Answer: D. Malaria
The most likely diagnosis is Malaria — specifically pointing toward Hyperreactive Malarial Splenomegaly (HMS) in the context of chronic/repeated infection.
Clinical Feature Mapping
| Feature | This Patient | Malaria Explanation |
|---|---|---|
| High-grade fever | ✓ | Cyclic fever from RBC lysis and merozoite release |
| Chills | ✓ | Classic "chills → fever → sweating" malarial triad |
| Low Hb (anemia) | ✓ | Hemolytic destruction of parasitized RBCs |
| Splenomegaly | ✓ | Reticuloendothelial hyperplasia due to RBC clearance |
| Raised IgM | ✓ | Polyclonal B-cell activation; hallmark of HMS |
According to Harrison's Principles of Internal Medicine (p. 6432):
"Chronic or repeated malarial infections produce hypergammaglobulinemia; normochromic, normocytic anemia; and splenomegaly... characterized by massive splenomegaly, hepatomegaly, marked elevations in serum IgM and malarial antibody titers."
The raised IgM is the discriminating clue here — it reflects chronic immune stimulation from repeated Plasmodium infection and is specifically documented in Hyperreactive Malarial Splenomegaly.
Why Not the Others?
| Option | Against It |
|---|---|
| A. CML | Massive splenomegaly present, but NO fever/chills as a primary feature; leukocytosis with myeloid shift, not anemia/raised IgM, dominates |
| B. Brucellosis | Can cause fever + splenomegaly, but raised IgM and hemolytic anemia are not characteristic; undulant fever pattern; usually from animal contact |
| C. Leishmaniasis (VL) | Can mimic malaria (fever, splenomegaly, raised Ig), but is associated with pancytopenia, more chronic/insidious course, and hypergammaglobulinemia is a late feature — Harrison's (p. 6491) notes VL is "easily mistaken for malaria" but chills and acute high fever favor malaria |
Key Teaching Point
The classic fever + chills + anemia (low Hb) + splenomegaly + raised IgM constellation is the textbook signature of malaria, particularly chronic or hyperreactive forms. When raised IgM is specifically highlighted alongside these features, it points directly to Hyperreactive Malarial Splenomegaly — a complication of repeated Plasmodium infections in endemic regions.
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