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(a) Axial noncontract chest CT (1 st time) of 64-year-old female with COVID-19, demonstrating a few quasi-circular GGOs in the right lung (red arrow). (b) Axial noncontract chest CT of the same patient 9 days after admission due to progression of the illness demonstrated the GGO increased in quantity and expansion of lung involvement (black arrow). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
