Fig. 4.

Non-contrast chest CT axial image (a) in a 62-year old COVID-19 positive male patient, obtained 9 days after symptom onset, showing sub-pleural curvilinear lines (black arrow) with multiple reticulations in right lower lobe and mixed GGO-consolidation pattern in left lower lobe. Fig. 3b in a different 61-year old COVID-19 positive male patient, obtained 6 days after symptom onset, shows evidence of sub-pleural reticulations (black arrow) in the posterior segment of right upper lobe with a few rounded morphology GGOs in left upper lobe.