Reversed Halo Sign
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References:

1) Hansell DM, Bankier AA, MacMahon AA. Fleischner Society: Glossary of Terms for Thoracic
Imaging. Radiology 2008;246(3):697-722
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2) Maimon N. A 47-year-old female with shortness of breath and “reversed halo sign.” Eur Respir
Rev 2010;19(115):83-85
[PDF]

3) Agarwal R, Aggarwal AN, Dupta D. Another cause of reverse halo sign: Wegener’s
granulomatosis. The British Journal of Radiology 2007;80:849-850
[PDF]

4) Kim SJ, Lee KS, Ryu YH. Reversed Halo Sign on High-Resolution CT of Cryptogenic
Organizing Pneumonia: Diagnostic Implications. AJR 2003;180:1251-1254
[PDF]

5) Gasparetto EL, Escuissato DL, Davaus T. Reversed Halo Sign in Pulmonary
Paracoccidioidomycosis. AJR 2005;184:1932-1934
[PDF]

6) Vouloudaki AE, Bouros DE, Froudarakis ME. Crescentic and Ring-Shaped Opacities: CT
features in two cases of bronchiolitis obliterans organizing pneumonia (BOOP). Acta
Radiologica 1996;37:889-892
[PDF]

7) Marchiori E, Grando RD, Simoes Dos Santos CE. Pulmonary tuberculosis associated with the
reversed halo sign on high-resolution CT. The British Journal of Radiology 2010;83:e58-e60
[PDF]

8) Benamore RE, Weisbrod GL, Hwang DM. Reversed halo sign in lymphomatoid
granulomatosis. The British Journal of Radiology 2007;80:e162-e166
[PDF]

9) Marchiori E, Zanetti G, Meirelles GSP. The Reversed Halo Sign on High-Resolution CT in
Infectious and Noninfectious Pulmonary Diseases. AJR 2011;197(1):W69-W75
[PDF]

10) Marchiori E, Zanetti G, Irion KL. Reversed Halo Sign in Active Pulmonary Tuberculosis:
Criteria for Differentiation From Cryptogenic Organizing Pneumonia. AJR 2011;197:1324-1327
[PDF]