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Radiology. 1993 Oct;189(1):119-23.

Focal organizing pneumonia: CT appearance.

Author information

1
Department of Radiology, Oska University Medical School, Japan.

Abstract

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.

[Indexed for MEDLINE]

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