CTICasesChronic Hypersensitivity Pneumonitis
Imaging findings
Chest CT shows upper-lobe predominant reticular opacities and traction bronchiectasis away from the pleural surfaces, with sparing of the lung bases. Surgical lung biopsy confirmed chronic HP with peribronchiolar metaplasia and loose granulomas.
Key takeaways
Chronic HP can mimic UIP/IPF but typically features upper-lung predominance, central/peribronchial distribution of fibrosis, and biopsy findings of peribronchial metaplasia, giant cells, and loose granulomas.
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