Lung - nontumor
Organizing pneumonia

Topic Completed: 1 September 2011

Revised: 29 January 2019, last major update September 2011

Copyright: (c) 2003-2017,, Inc.

PubMed search: organizing pneumonia [title] pulmonary

Elliot Weisenberg, M.D.
Page views in 2019: 5,604
Page views in 2020 to date: 2,780
Cite this page: Weisenberg E. Organizing pneumonia. website. Accessed June 7th, 2020.
Clinical features
  • Response to infectious or inflammatory injury to the lung
  • Pneumonia may resolve or organize
  • Organizing pneumonia may simulate malignancy due to radiographic shadows and clinical cough, hemoptysis and weight loss
  • May also simulate TB (Pathol Int 2011;61:486)
  • Usually due to Streptococcus pneumoniae or Haemophilus influenza
Case reports
Gross description
  • Sharply outlined, firm area with preservation of lung pattern; extends to thickened pleura
Microscopic (histologic) description
  • Exudate of fibrin and neutrophils transforming into fibromyxoid masses with histiocytes; may have necrotizing changes in bronchi
Microscopic (histologic) images

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Histopathology Lung - Organizing pneumonia
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