Hypersensitivty pneumonitis HP

• Facts:
  Restrictive lung disease
  Exposure to antigens leading to alveolar thickening and granulomas
• Diagnosis:
  Farmers lung
  Spores of actinomycetes from moldy hay
  
  Bird fanciers lung
  Antigens from feathers, excreta, serum
  
  Mushroom worker's lung
  Spores of actinomycetes from compost
  
  Malt worker's lung
  Spores of Aspergillus clavatus in grain
  
  Grain handler's lung
  Grain weevil dust
  
  Bagassosis
  Spores of actinomycetes from sugarcane
  
  Air conditioner lung
  Spores of actinomycetes from air conditioners
• Treatment:
  Avoidance of antigen
• Associated With:
  Arthus reaction