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Uncommon imaging findings of COVID-19 pneumonia on chest CT: halo sign and pleural effusion. a A 58-year-old man with COVID-19 infection: chest CT shows typical halo sign (arrow) characterized by a nodule surrounded by ground-glass opacity. b A 67-year-old woman with COVID-19 infection: chest CT demonstrates ground-glass opacities in the inferior lobes and mild bilateral pleural effusion
