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 #Reverse #Halo #Sign #differential #diagnosis #pulmonary #radiology
