An important differentiating feature of hypersensitivity pneumonitis is the presence of air trapping, which is the primary reason to perform expiratory imaging as part of the CT examination.6 On the expiratory RV image, we see areas of air trapping, suggesting HP.
6. Arakawa H, Niimi H, Kurihara Y, Nakajima Y, Webb WR. Expiratory high-resolution CT: diagnostic value in diffuse lung diseases. Am J Roentgenol. 2000;175:1537-1543.
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