Restrictive Lung Disease USMLE Step 1 Practice Question
A 42-year-old pigeon breeder presents with acute onset of fever (38.9°C), chills, and dyspnea 4 hours after cleaning his loft. Vitals show HR 110, RR 28, SpO2 88% on room air. Chest X-ray demonstrates diffuse ground-glass opacities bilaterally. PFTs reveal reduced FVC (65% predicted) with FEV1/FVC ratio of 78%. Serum IgG antibody to pigeon antigen is elevated. No recent medication use. Which of the following is the most likely diagnosis?
Answer choices
- ACoccidioidomycosis
- BAvian influenza
- CIdiopathic pulmonary fibrosis
- DAcute hypersensitivity pneumonitisCorrect answer
- EAtypical pneumonia
- FOrganic dust toxic syndrome (ODTS)
See the full explanation
Get the correct-answer rationale, why each distractor is wrong, the underlying mechanism, and high-yield associations — plus adaptive practice that targets your weak areas — with a free MedBoardPRO account.