Table 3.

CT image observations at different stages of the COVID-19 [49, 68]

Early-stage	Progressive stage	Advance stage
Localized lesions are mostly restricted to pleural or peribroncho-vascular regions of one lung or both lungs Patchy pure GGOs Focal GGOs Vascular dilation	Consolidation Stretch of pure GGOs Bilateral peripheral GGOs Vascular enlargement in lesions The predominant lesion in the lower lung Interlobular septal thickening, with crazy-paving patterns Reticular marking in sub-pleural or peribroncho-vascular regions Rare pleural effusion	Diffused lesions in both lungs and expansion of bilateral pulmonary lesions Dense and enlarged consolidation GGOs surrounding consolidation Parenchymal bands Pleural effusion