Fig. 2: Representative chest CT images of patients with COVID-19 pneumonia.

a Subpleural patchy areas of GGO with crazy-paving sign in the right middle lobe. b Multiple patchy areas of consolidation in the right middle lobe, left upper lobe, and bilateral lower lobes and air bronchogram in the right middle lobe. c Multiple patchy areas of organizing pneumonia in the right middle and lower lobes on the sagittal image with CT severity score of 9 for the right lung. d Bilateral and peripheral multiple patchy areas of GGO with reticular and intralobular septal thickening. e Multiple mixed distributed pure GGO, GGO with consolidation, and interlobular septal thickening in bilateral lungs. f Bilateral multiple patchy and thin areas of GGO in the posterior parts of the lungs.