Image analysis, focused on the lesion features of each patient, included (a) distribution characteristics, (b) number of lobes involved, (c) lobe of lesion distribution, (d) patterns of the lesion (e.g., ground glass opacification, consolidation, cavitation, crazy paving pattern), (e) other signs in the lesion (e.g., interlobular septal thickening, air bronchogram sign), and (f) other findings (e.g., adjacent pleura thickening, pleural effusion, pericardial effusion, thoracic lymphadenopathy, pulmonary emphysema).