Cryptogenic organizing pneumonia

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aka BOOP

  • Idiopathic inflammation of the bronchioles and surrounding tissue causing granulation tissue and "non-infectious pneumonia"
  • Patchy peripheral subpleural or peribronchovascular consolidation
  • Atoll sign or reverse CT halo
  • Responds to steroids not antibiotics
  • a/w many systemic diseases (lupus, c-anca, GVHD, etc)
  • No pleural effusion or lymphadenopathy