Hypersensitivity pneumonitis: patterns on high-resolution CT
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Updated: Aug 14, 2026

Imaging Features of Systemic Sclerosis-Associated Interstitial Lung Disease
Published on: June 16, 2020
R A Patel1, D Sellami, M B Gotway
1Department of Radiology, University of California at San Francisco, 94143-0628, USA. rita.patel@radiology.ucsf.edu
Abstract:
Hypersensitivity pneumonitis, also known as extrinsic allergic alveolitis, is caused by inhalation of specific environmental organic antigens. This disease may have typical high-resolution CT findings that, in the appropriate clinical setting, can be sufficiently characteristic to allow a confident diagnosis without the need for a lung biopsy. In this pictorial essay, the high-resolution CT patterns of hypersensitivity pneumonitis are illustrated. The authors emphasize the correlation among the radiologic presentation, functional abnormalities, and pathologic findings.
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