Fig. 4.

(a) Erect chest radiography of 57-year-old female with COVID-19 demonstrated a focal opacity in the right lower lung zone (white arrow). (b) Axial noncontract chest CT (1 st time) of the same patient showed a few GGOs in the both lungs (black arrows). (c) Axial noncontract chest CT of the same patient 10 days after admission due to progression of the disease demonstrated GGOs increased in quantity and size, accompanied with consolidation (red arrows). (d) Axial noncontract chest CT of this patient after 21days of treatment demonstrated the aforementioned the GGO and consolidation absorbed, and some fibrotic stripes noted in the corresponding region of the both lungs. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)