“ Siderosis Most commonly seen in those exposed to metal fumes (e.g. welders). Changes in the lung are reversible. Plain film • Small peri...
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Siderosis
Most commonly seen in those exposed to metal fumes (e.g. welders). Changes in the lung are reversible.
Plain film
• Small perihilar nodules
HRCT
• Small centrilobular nodules and branching linear structures (iron oxide particles in the lymphatics)
• Extensive ground-glass opacification less common
Stannosis
- Due to deposition of tin oxides in the lung.
- They are very dense on imaging, but induce little reaction from the lung.
Plain film
• Widespread, high-density miliary nodules
Opacity typically appears rapidly (within 12 hours) on radiography and resolves slowly (>2 months in some cases) after successful treatment. Immunosuppression and the coexistence of diabetes, neutropenia, etc., delay infiltrate formation. Cavitation suggests infection with Staphylococcus.
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