CTICasesMixed Dust Pneumoconiosis (Desert Sand Exposure)
Imaging findings
High-resolution CT demonstrates multiple small, well-defined subpleural nodules ("subpleural dots") bilaterally. In regions of confluence, these dots merge to form pseudoplaques. There is also co-existing centrilobular emphysema.
Key takeaways
Exposure to blowing desert sand or dust storms can lead to mixed dust pneumoconiosis. The key radiographic and CT feature is the presence of tiny, well-defined subpleural nodules representing lymphatic dust accumulation at the lung periphery. When confluent along the pleural surfaces, these can form pseudoplaques mimicking other mineral dust exposures like silicosis or coal workers' pneumoconiosis.
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