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Hypersensitivity pneumonitis

Case contributed by Yi-Jin Kuok
Diagnosis almost certain

Presentation

Hypoxia. ? Asthma. Response to steroid therapy. A chest radiograph is performed.

Patient Data

Age: 12 years
Gender: Female
x-ray

Subtle perihilar alveolar infiltrate.

Perihilar ground glass changes.

Poor expiratory effort reveals peripheral gas trapping.

Case Discussion

Further history reveals the patient slept near her pet parrot. 

Learning point: hypersensitivity pneumonitis can mimic asthma (clinically, not radiologically) and the patient improves with steroid therapy.

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