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Reversed Halo Sign on High-Resolution CT of Cryptogenic Organizing Pneumonia: Diagnostic Implications

Sang Jin Kim1, Kyung Soo Lee2, Young Hoon Ryu1, Young Cheol Yoon2, Kyu Ok Choe3, Tae Sung Kim2 and Ki Jun Sung4

1 Department of Diagnostic Radiology, Yonsei University College of Medicine, YongDong Severance Hospital, Seoul 135-270, Korea.
2 Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50, Ilwon-Dong, Kangnam-Ku, Seoul 135-710, Korea.
3 Research Institute of Radiologic Science, Yonsei University, Seoul 120-752, Korea.
4 Department of Diagnostic Radiology, Yonsei University Wonju College of Medicine, Wonju 220-701, Korea.



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  		Fig. 1A. —48-year-old man with cryptogenic organizing pneumonia. Thin-section (1.5-mm collimation) CT scans obtained at levels of aortic arch (A) and bronchus intermedius (B) show patchy ground-glass opacity, consolidation, and nodule (small arrow, B) mainly with peribronchovascular distribution. Some abnormalities appear with reversed halo signs (central ground-glass opacity and surrounding air-space consolidation of crescentic and ring shapes) (large arrows).

 


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  		Fig. 1B. —48-year-old man with cryptogenic organizing pneumonia. Thin-section (1.5-mm collimation) CT scans obtained at levels of aortic arch (A) and bronchus intermedius (B) show patchy ground-glass opacity, consolidation, and nodule (small arrow, B) mainly with peribronchovascular distribution. Some abnormalities appear with reversed halo signs (central ground-glass opacity and surrounding air-space consolidation of crescentic and ring shapes) (large arrows).

 


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  		Fig. 2A. —73-year-old man with cryptogenic organizing pneumonia. Thin-section (1.5-mm collimation) CT scans obtained at level of azygos arch (A) and bronchus intermedius (B) show patchy consolidation and ground-glass opacity in both lungs. Note parenchymal abnormalities with reversed halo signs (arrows).

 


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  		Fig. 2B. —73-year-old man with cryptogenic organizing pneumonia. Thin-section (1.5-mm collimation) CT scans obtained at level of azygos arch (A) and bronchus intermedius (B) show patchy consolidation and ground-glass opacity in both lungs. Note parenchymal abnormalities with reversed halo signs (arrows).

 

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