A 45-year-old coal mine worker presents with cutaneous nodules, joint pain and occasional cough with dyspnea. His chest radiograph shows multiple small (1-4 cm) nodules in bilateral lung fields. Some of the nodules show cavitation and specks of calcification. Most likely these features are diagnostic of –

**Core Concept**
Coal workers' pneumoconiosis (CWP) is a lung disease caused by the inhalation of coal dust, leading to fibrosis, inflammation, and nodular lesions in the lungs. The disease can progress from simple to complicated CWP, characterized by nodules with cavitation and calcification, often associated with systemic symptoms like joint pain.

**Why the Correct Answer is Right**
The presence of multiple small nodules in bilateral lung fields with cavitation and calcification is highly suggestive of complicated coal workers' pneumoconiosis. The disease is caused by the accumulation of coal dust in the lungs, leading to chronic inflammation and fibrosis, which results in the formation of nodules. The cavitation and calcification of these nodules are indicative of advanced disease. The systemic symptoms like joint pain and cough with dyspnea are also consistent with CWP.

**Why Each Wrong Option is Incorrect**
**Option A:** Silicosis is another type of occupational lung disease caused by the inhalation of silica particles, but it typically presents with different radiographic findings, such as fine nodular opacities and upper lobe predominant disease.

**Option B:** Tuberculosis can present with nodular lesions in the lungs, but it is typically associated with cavitation, but not calcification, and often has a more focal distribution.

**Option C:** Sarcoidosis can cause nodular lesions in the lungs, but it is typically associated with systemic symptoms like fever and weight loss, and often has a more diffuse distribution on chest radiographs.

**Clinical Pearl / High-Yield Fact**
Coal workers' pneumoconiosis is a preventable disease, and its risk can be significantly reduced by implementing proper dust control measures in coal mines, such as using respirators and reducing dust levels.

**Correct Answer:** C.

✓ Correct Answer: B. Caplan's syndrome