A person who works at a foundry, or who mines hard rocks, or sandblasts would be most likely to develop which condition?

• A. Silicosis
• B. Coal workers' pneumoconiosis
• C. Asbestosis
• D. Sarcoidosis

Answer: (A)

Inhaled crystalline silica from activities like foundry work, hard-rock mining, or sandblasting leads to silicosis. Tiny silica particles reach the distal airways and alveoli, where macrophages try to engulf them but silica is toxic to these cells. This injury sparks a cascade of cytokines that recruits fibroblasts and deposits collagen, forming nodules that can merge into progressive fibrosis. The disease characteristically affects the upper lungs and may show eggshell-like calcification of the hilar lymph nodes on imaging. Over time, it can progress to massive fibrosis and markedly increases the risk of tuberculosis due to impaired macrophage function. This exposure pattern points to silicosis, whereas coal dust exposure causes coal workers’ pneumoconiosis, asbestos exposure causes asbestosis, and sarcoidosis is not specifically tied to these occupational situations.