Pulmonary stannosis is a condition in which tin oxide is deposited in lung tissue after inhalation. Tin oxides i.e. tin oxide, a.k.a. stannous oxide (SnO), and tin dioxide, a.k.a. stannic oxide (SnO2), are radiologically-visible and are extremely dense, although there is no tissue reaction to their presence. Due to this reason it is sometimes classified as a non-fibrotic pneumoconiosis.
For radiographic appearance of multiple extremely dense nodules, consider:
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