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Halo Sign on Chest CT • SPN or mass surrounded by a circumferential GGO • DDx: invasive pulm aspergillosis, pulm mueormycosis, GPA, amyloidosis, sarcoidosis, mets to the lung https://doi.org/10.1016/j.chest.201 #Halo #Sign #CT #Lung #Pulmonary #diagnosis #radiology #clinical