CTICasesHypersensitivity Pneumonitis (Farmer's Lung)
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Imaging findings
Patchy perihilar opacity and mosaic attenuation with areas of lobular decreased attenuation.
Key takeaways
The history of working on a dairy farm around silage and hay strongly suggested hypersensitivity pneumonitis (farmer's lung). The imaging findings of mosaic attenuation and air trapping fit well with HP. This was considered a classic example, with a fitting history and exclusion of other conditions like PE.
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