CTICasesHypersensitivity pneumonitis mimicking respiratory bronchiolitis in a former smoker
Imaging findings
CT scan of a former smoker shows upper-lobe predominant, centrilobular ground-glass nodules and air trapping. History confirmed recent exposure to a pet cockatiel and positive avian antigens.
Key takeaways
Hypersensitivity pneumonitis (HP) can present with centrilobular nodules and air trapping that mimic respiratory bronchiolitis. Differentiating the two is critical, as HP requires antigen avoidance and has a different clinical course.
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