CTICasesChronic HP with Air Trapping
Imaging findings
CT chest shows progressive reticular fibrosis and traction bronchiectasis with multiple spared lobules. Expiratory CT demonstrates non-dependent, patchy lobular air trapping, confirming chronic HP.
Key takeaways
Expiratoral air trapping in non-dependent lobules (especially in the mid/upper zones) is a helpful feature to differentiate chronic HP from UIP as fibrosis progresses.
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