Fig. 1

Axial thin-section CT scans in four COVID-19 patients with negative RT-PCR at baseline. a 15-year-old male (6 days after symptom onset to CT scan) shows multiple focal ground-glass opacities associated with linear inter and intralobular septal thickening in upper lobes. b 54 years old male (10 days after symptom onset to CT scan) shows bilateral and predominantly peripheral consolidation pattern in both lower lobes. c 73 years old female (7 days after symptom onset to CT scan) shows extensive bilateral, peripheral, sub-pleural mixed ground-glass opacities in both lower and upper lobes. d 56-year-old male (10 days after symptom onset to CT scan) shows predominantly diffuse consolidation in both lungs