Focal organizing pneumonia: CT appearance

Radiology. 1993 Oct;189(1):119-23. doi: 10.1148/radiology.189.1.8372180.


Purpose: To clarify the computed tomographic (CT) features of focal organizing pneumonia.

Materials and methods: The authors retrospectively studied CT scans of 18 patients with histologically proved focal organizing pneumonia. Chest radiographs in all 18 patients suggested bronchogenic carcinoma.

Results: Seventeen of the 18 lesions (94%) had an irregular margin, 10 (56%) had satellite lesions, nine (50%) had a pleural tag, and nine (50%) had an air bronchogram. The pneumonia could be classified into three types: Type A (n = 5) was a small round mass (pleural tag, n = 4). Type B (n = 7) was an oval mass with broad contact with the pleura (satellite lesions and convergence of peripheral vessels, n = 6). Type C (n = 6) was an oval mass along the bronchovascular bundle (satellite lesions, n = 3; pleural tag, n = 4).

Conclusion: The CT features of focal organizing pneumonia show wide variation, and some type B and C lesions are suggestive of benign lesions. However, other lesions may be difficult to differentiate from bronchogenic carcinoma even with CT.

MeSH terms

  • Adult
  • Aged
  • Bronchography
  • Carcinoma, Bronchogenic / diagnostic imaging
  • Diagnosis, Differential
  • Female
  • Follow-Up Studies
  • Humans
  • Lung / diagnostic imaging
  • Lung Neoplasms / diagnostic imaging
  • Male
  • Middle Aged
  • Pleura / diagnostic imaging
  • Pneumonia / classification
  • Pneumonia / diagnostic imaging*
  • Radiography, Thoracic
  • Tomography, X-Ray Computed* / methods