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Table 2 Reporting language by RSNA for CT findings related to COVID-19

From: COVITALE 2020 from eastern Indian population: imageologists perspective, a learning curve

Classification CT findings Rationale
Typical appearance Peripheral, bilateral, GGO with or without consolidation or visible intralobular lines (“crazy-paving”)
Multifocal GGO of rounded morphology with or without consolidation or visible intralobular lines (“crazy-paving”)
Reverse halo sign or other findings of organizing pneumonia (seen later in the disease)
Commonly reported imaging features of greater specificity for COVID-19 pneumonia
Indeterminate appearance Absence of typical features AND presence of:
Multifocal, diffuse, perihilar or unilateral GGO with or without consolidation lacking a specific distribution and are non-rounded or non-peripheral
Few very small GGO with a non-rounded and non-peripheral distribution
Non-specific imaging features of COVID-19 pneumonia
Atypical appearance Absence of typical or indeterminate features and presence of:
Isolated lobar or segmental consolidation without GGO
Discrete small nodules (centrilobular,“tree-in bud”)
Lung cavitation
Smooth interlobular septal thickening with pleural effusion
Uncommonly or not reported features of COVID-19 pneumonia
Negative for pneumonia No CT features to suggest pneumonia No features of pneumonia