image findings in hypersensitivity pneumonitis include GGO, centrilobular micronodules, and mosaicism

• related: HP hypersensitivity pneumonitis
• tags: #permanent
• source: Fundamentals of High Resolution Lung CT, An Algorithmic Approach to Lung Disease

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GGO

• ground glass opacity can be predominant findings in subacute HP

Centrilobular micronodules

• Hypersensitivity pneumonitis with centrilobular distribution

• hypersensitivity pneumonitis with centrilobular consolidation, air bronchogram
• air bronchogram differentiates HP from sarcoidosis (pulmonary sarcoidosis findings include mediastinal lymphadenopathy and perilymphatic nodules)

Mosaicism and headcheese sign

Distribution

• distribution usually more in mid lung and more central in location as compared to lower lung and peripheral in other interstitial pneumonias

Chronic

• fibrosis is finding for chronic HP
• bronchiectasis is more traction than central¹

Links to this note

• An Algorithmic Approach to Lung Disease
  • image findings in hypersensitivity pneumonitis include GGO, centrilobular micronodules, and mosaicism
• HP hypersensitivity pneumonitis
  • image findings in hypersensitivity pneumonitis include GGO, centrilobular micronodules, and mosaicism

Footnotes

1. Bronchiectasis Lecture by Jennifer Krall? ↩