Fig. 1

The importance of CT in showing the ground-glass opacities common in disease. a. PA chest radiograph of a 66-year-old male patient in 2016. b. chest radiograph on March 23, 2020. There is no significant difference between the two graphics. The chest radiography is mostly normal, especially during the early disease period. c-d. CT of the same patient on the same date as the second X-ray (March 23, 2020) shows ground-glass opacities (black arrows) in the right middle and bilateral lower lungs and findings were suspicious for COVID-19. The sensitivity of chest radiograph is always lower in demonstrating ground-glass opacities of these sizes and low density