Reverse Halo Sign

Defined as a central ground class opacity surrounded by a ring of dense consolidation

Differential Diagnosis: 

 • Infection: Mucormycosis, Aspergillosis, Tuberculosis, Pneumocystis jiroveci

 • Autoimmune: Granulomatosis with polyangiitis

 • Vasculature: Pulmonary infarction secondary to PE

 • Malignancy: Primary pulmonary neoplasms, metastatic disease

 • Other: Cryptogenic organizing pneumonia, Sarcoidosis, Radiation pneumonitis



By @PulmPEEPs



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