Reverse Halo Sign

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 ?
Findings on imaging that suggest pulmonary mucormycosis are greater than ten nodules, presence of pleural effusion, and a reverse halo sign on CT chest [2,10,11].
Reverse halo sign is a diagnostic radiological clue for the diagnosis of mucormycosi.
The reverse halo sign is an uncommon but relatively specific radiologic sign of cryptogenic organizing pneumonia.