Fig. 4.

(A) CXR image of a 75-year-old patient who came to the emergency department and presented with 1-day history of COVID-19 infection-compatible symptoms without initial radiographic abnormalities and with a positive PCR result for SARS-CoV-2. (B) CXR image, 4 days later, in which bilateral GGO are identified. (C) CXR image, 2 days later, in which a reticular pattern is observed due to septal thickening with persistence of GGO.