Epidemiological and clinical characteristics of fifty-six cases of COVID-19 in Liaoning Province, China

Figure 2 Progression of pneumonia as observed in the lung computed tomography images of a serious case (51-year-old male patient). A: Multiple small patchy opacities and large areas of ground-glass opacity in both lungs, particularly in the outer zones and under the pulmonary pleurae; larger area of lesion in the basal segment of the lower right lobe, with air bronchogram and vascular thickening visible inside [computed tomography (CT) taken on February 3, 2020, the 7^th d after disease onset]; B: Multiple small patchy opacities and large areas of ground-glass opacity in both lungs, particularly in the middle and outer zones of bilateral lung fields and under the pulmonary pleurae; the lesions have slightly increased in number and size (CT taken on February 5, 2020, the 9^th d after disease onset); C: Multiple small patchy opacities and large areas of ground-glass opacity in both lungs, particularly in the middle and outer zones and under the pulmonary pleurae; new patchy opacities and large areas of ground-glass opacity can be observed in the bilateral lower lobes and the right middle lobe (CT taken on February 10, 2020, the 14^th d after disease onset); D: Multiple small patchy opacities and large areas of ground-glass opacity in both lungs, particularly in the middle and outer zones and under the pulmonary pleurae; the scope of the lesions shows a clear reduction (CT taken on February 17, 2020, the 21^st d after disease onset).