Fundamentals of High Resolution Lung CT

• related: Pulmonology, An Algorithmic Approach to Lung Disease
• tags: #literature
• source:

Hypersensitivity pneumonitis

• HP hypersensitivity pneumonitis
• p186
  • HP is result of immune reaction to organic inhalants
  • acute HP is rare: moldy hay in farmer's lung is an example
  • subacute HP most common in weeks to months
    • histologically represented by inflammation
  • chronic HP causes fibrosis
  • bronchiolocentric and poorly formed granulomas a compared to well formed in sarcoidosis
• p187
  • subacute HP image finding includes GGO, centrilobular nodules, mosaicism, headcheese sign (combination of GO and mosaicism), mid lower lung distribution, spares costophrenic angles
  • centrilobular nodule reflects peribronchovascular inflammation, poorly marginated granuloma, cellular infiltration
• p188
  • centrilobular nodules usually associated with low attenuation areas of mosaic perfusion (headcheese sign)
• p189
  • distribution usually in mid lung and more central as compared to peripheral and lower lung in other interstitial pneumonias

Links to this note

• chest imaging
  • Fundamentals of High Resolution Lung CT
• HP hypersensitivity pneumonitis
  • Fundamentals of High Resolution Lung CT
• image findings in hypersensitivity pneumonitis include GGO, centrilobular micronodules, and mosaicism

  • source: Fundamentals of High Resolution Lung CT, An Algorithmic Approach to Lung Disease

• ABPA image findings include central, asymmetric bronchiectasis, bronchial wall thickening, and mucoid impaction
  • source: An Algorithmic Approach to Lung Disease, Fundamentals of High Resolution Lung CT