Reverse Halo Sign

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A term of art referring to one or more rounded areas in the lungs with central ground-glass attenuation encircled by a ring of denser consolidation, best seen on high-resolution CT. The reverse halo sign was first described as specific for cryptogenic organising pneumonia.
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References in periodicals archive ?
Morio et al., "Prevalence of the reversed halo sign in neutropenic patients compared with non-neutropenic patients: data from a single-centre study involving 27 patients with pulmonary mucormycosis (2003-2016)," Mycoses, vol.
The reversed halo sign: update and differential diagnosis.
Reversed halo sign on computed tomography: state-of-the-art review.
(3) This appearance has also been dubbed the "reversed halo sign" (Figures 1 through 4).
Kontoyiannis, "The diagnostic value of halo and reversed halo signs for invasive mold infections in compromised hosts," Clinical Infectious Diseases, vol.