CT signs Frequency Stage
Ground glass opacity ++++ E/A/S
Consolidation without ground glass opacity ++ S
Ground glass opacity and crazy paving ++ E/A/S
Ground glass opacity with consolidation +++ E/A/S
Patchy ground glass opacity +++ E
Bilateral distribution ++++ E/A/S/D
Peripheral distribution +++ E
Air bronchogram ++ E/A/S
Pleural effusion + S
Strip-like opacity + D