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

Focal organizing pneumonia: CT appearance

N Kohno  1 , J Ikezoe, T Johkoh, N Takeuchi, N Tomiyama, S Kido, H Kondoh, J Arisawa, T Kozuka
Affiliations

Focal organizing pneumonia: CT appearance

N Kohno et al. Radiology. 1993 Oct.

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.

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