CT slices of the lung window in different cases with COVID-19 pneumonia. A. Patient with no imaging findings; B. A small ground-glass opacity is seen in the left lung - CO-RADS 3 changes, later confirmed with PCR test; C. Low density ground-glass opacity in the right lung – COVID-19 pneumonia, initial stage; D. Ground-glass opacity in the left lung - mild COVID-19 pneumonia; E. Ground-glass opacities in the periphery of both lungs - COVID-19 pneumonia, 7 days; F. Ground-glass opacities in the periphery of both lungs - mild COVID-19 pneumonia, duration 10 days; G. Oval dense ground-glass opacity in the right lung - COVID-19 pneumonia, 14 days; H. Diffuse interstitial thickening in the periphery of both lungs - COVID-19 pneumonia, duration 14 days; I. Diffuse infiltrate in the 6th segment of the right lung - COVID-19 pneumonia, duration >14 days.