Chronic Hypersensitivity Pneumonitis | IPF Radiology Rounds

Chronic Hypersensitivity Pneumonitis

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.

Spectrum of Findings with Chronic Hypersensitivity Pneumonitis

Fibrotic Sarcoidosis

Idiopathic Pulmonary Fibrosis (an Update) and Progressive Pulmonary Fibrosis in Adults: An Official ATS/ERS/JRS/ALAT Clinical Practice Guideline

Reference

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.