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Original Research: Chest Infections |

Reversed Halo Sign in Invasive Fungal InfectionsReversed Halo Sign in Invasive Fungal Infections: Criteria for Differentiation From Organizing Pneumonia

Edson Marchiori, MD, PhD; Edith M. Marom, MD; Gláucia Zanetti, MD, PhD; Bruno Hochhegger, MD, PhD; Klaus L. Irion, MD, PhD; Myrna C. B. Godoy, MD
Author and Funding Information

From the Federal University of Rio de Janeiro (Drs Marchiori, Zanetti, and Hochhegger), Rio de Janeiro, Brazil; University of Texas MD Anderson Cancer Center (Drs Marom and Godoy), Houston, TX; and Royal Liverpool and Broadgreen University Hospital NHS (Dr Irion), Liverpool, England.

Correspondence to: Edson Marchiori, MD, PhD, Rua Thomaz Cameron, 438, Valparaiso, CEP 25685,120, Petrópolis, Rio de Janeiro, Brazil; e-mail: edmarchiori@gmail.com


Funding/Support: The authors have reported to CHEST that no funding was received for this study.

Reproduction of this article is prohibited without written permission from the American College of Chest Physicians. See online for more details.


Chest. 2012;142(6):1469-1473. doi:10.1378/chest.12-0114
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Background:  The purpose of this study was to identify CT scan findings that differentiate the reversed halo sign (RHS) caused by invasive fungal infection (IFI) from the RHS caused by organizing pneumonia (OP).

Methods:  We retrospectively reviewed CT scans of patients with RHS caused by IFI or OP. The study included 15 patients with proven or probable IFI (eight men and seven women) and 25 patients with biopsy-proven OP (13 women and 12 men). The CT images were reviewed individually by two chest radiologists who were blinded to the final diagnosis.

Results:  Reticulation inside the RHS was observed in 14 of the 15 patients with IFI (93%) and in no patient with OP. The maximal thickness of the consolidation rim was 2.04 ± 0.85 cm for IFI and 0.50 ± 0.22 cm for OP. Pleural effusion was noted in 11 of the 15 patients with IFI (73%) and in no patient with OP. Other parenchymal abnormalities, such as consolidation and ground-glass and linear opacities, were observed in both groups. The number of lesions showing the RHS did not differentiate IFI and OP.

Conclusion:  The presence of reticulation inside the RHS, outer rim thickness > 1 cm, and associated pleural effusion strongly suggest the diagnosis of IFI rather than OP.

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