CTICasesAcute hypersensitivity pneumonitis
Imaging findings
Chest CT shows diffuse, bilateral ground-glass opacities in the lower lobes with geographic areas of lung sparing, and numerous centrilobular nodules in the upper lobes, in a patient with acute dyspnea after bird exposure. Biopsy confirmed non-necrotizing granulomas.
Key takeaways
Acute hypersensitivity pneumonitis can present as an acute lung injury with extensive ground-glass opacities and centrilobular nodules following massive antigen inhalation (such as bird droppings). It must be differentiated from diffuse alveolar damage.
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