CTICasesBird Fancier's Lung
Imaging findings
CT chest shows diffuse ground-glass opacities, poorly-defined centrilobular nodules, and mosaic air trapping (three-density sign) on expiratory images in a 58-year-old female. The patient lives with two pet birds, and infectious workup was negative.
Key takeaways
Bird fancier's lung is a common form of hypersensitivity pneumonitis (HP) caused by inhalation of avian proteins. The typical CT appearance is that of subacute HP, presenting with diffuse ground-glass, centrilobular nodules, and mosaic attenuation representing air trapping. Treatment involves antigen avoidance and corticosteroids.
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