Table 1.

Chest CT findings according to structure by British Society of Thoracic Imaging in COVID-19 pneumonia.

Pattern	Appearance
Classical COVID-19 (100% compatible)	Peripherally, lower lobe predominant, multiple, bilateral* ground glass opacities (GGOs) +Crazy paving Peripherally consolidation** Air bronchogram Converse halo sign/perilobullary pattern**
Possible COVID-19 (71–99% compatible)	Peripherally, lower lobe predominant, bronchocentric consolidation Converse halo sign/perilobullary pattern** Limited GGOs
Indeterminate (<70% compatible)	Incompatible with the other 3 radiological groups. Compatible with radiological appearance but has another diagnosis such as ILD, CTD.
COVID-19 exclusion (<70% compatible with another diagnosis)	Lobar pneumonia Cavitation Tree in bud/nodularity Lymphadenopathy Pleural effusion Advanced pulmonary fibrosis

*>1 lesion can be unilaterally.

**Organised pneumonia pattern.