Hypersensitivity pneumonitis

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  • Subacute - diffuse ground glass nodules in a cebtrilobular distribution
  • Spares pleura
  • Air trapping (mosaic perfusion)
  • Chronic head cheese appearance on expiratory imaging due to three different attenuation, low (air-trapping), normal lung and denser
  • Upper lobe


  • Bird fancier's lung, farmer's lung
  • Exposure to organic dust


  • Fever, chills, cough, dyspnea