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.
References in periodicals archive ?
Reversed halo sign on computed tomography: state-of-the-art review.
Reversed halo sign on high-resolution CT of cryptogenic organizing pneumonia: diagnostic implications.