CTICasesHypersensitivity Pneumonitis (Bird Fancier's Lung)
Imaging findings
Chest radiograph shows bilateral, somewhat difficult-to-characterize subtle opacities. CT demonstrates dramatic mosaic attenuation with geographic, confluent ground-glass opacities and only mild air trapping, without a dedicated expiratory acquisition available.
Key takeaways
The patient had chronic, non-acute respiratory symptoms and a forty-seven-year history of keeping a pet cockatiel at home. The dramatic mosaic attenuation and ground-glass pattern, combined with this avian exposure history, supported a presumptive diagnosis of hypersensitivity pneumonitis, illustrating how a striking mosaic and ground-glass pattern can strongly suggest the diagnosis even without dedicated expiratory imaging when the exposure history is convincing.
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