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.
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].