Pneumoconiosis: High-Yield Pathology
Pneumoconiosis refers to a group of interstitial lung diseases caused by the inhalation of inorganic dusts. The severity depends on the size/shape of the particles, concentration, and duration of exposure.
1. Key Associations for Exams
| Disease | Exposure | Key Features |
|---|---|---|
| Coal Worker’s | Coal dust | Coal macules/nodules. Associated with Caplan syndrome (RA + pneumoconiosis). |
| Silicosis | Sandblasting, mining | Eggshell calcification of hilar nodes. Increased risk of TB. |
| Asbestosis | Shipbuilding, roofing | Ferruginous bodies (iron-stained); pleural plaques. Risk of Mesothelioma. |
| Berylliosis | Aerospace, manufacturing | Non-caseating granulomas (mimics Sarcoidosis). |
2. Exam Must-Knows
- Silicosis and TB: Silica impairs macrophage function, specifically inhibiting phagolysosome formation, which significantly increases susceptibility to M. tuberculosis.
- Asbestosis Location: Fibrosis is predominantly in the lower lobes. This is a common board differentiator from other fibrotic conditions like coal dust or silica.
- Mesothelioma: The most common cancer associated with asbestos is actually bronchogenic carcinoma, but mesothelioma is the most specific.
Pathology Board Hint: For vignettes, memorize the buzzwords: “Eggshell calcification” = Silicosis, “Ferruginous/Asbestos bodies” = Asbestosis, and “Non-caseating granulomas + Aerospace industry” = Berylliosis.