Chest CT Diagnostic classification system: Non COVID
The British Society of Thoracic Imaging (BSTI) guidelines (attached below) have outlined features that define Non COVID:
- Lobar pneumonia
- Cavitating infections
- Tree-in bud/ centrilobular nodularity
- Lymphadenopathy, effusions
- Established pulmonary fibrosis
Radiological Society of North America (RSNA) guidelines (attached below) have outlined features that define Atypical COVID:
- 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
The RSNA have also provided some guidance on structuring CT reports for Indeterminate COVID:
“Imaging features are atypical or uncommonly reported for (COVID-19) pneumonia. Alternative diagnoses should be considered.”
Chest CT Diagnostic classification system: Non COVID
The British Society of Thoracic Imaging (BSTI) guidelines (attached below) have outlined features that define Non COVID:
- Lobar pneumonia
- Cavitating infections
- Tree-in bud/ centrilobular nodularity
- Lymphadenopathy, effusions
- Established pulmonary fibrosis
Radiological Society of North America (RSNA) guidelines (attached below) have outlined features that define Atypical COVID:
- 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
The RSNA have also provided some guidance on structuring CT reports for Indeterminate COVID:
“Imaging features are atypical or uncommonly reported for (COVID-19) pneumonia. Alternative diagnoses should be considered.”
Resources
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Thoracic Imaging in COVID-19 Infection (BSTI)
Guidance for the Reporting Radiologist British Society of Thoracic Imaging
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RSNA Expert Consensus Statement on Reporting Chest CT Findings Related to COVID-19
The goal of this expert consensus is to help radiologists recognize findings of COVID-19 pneumonia and aid their communication with other healthcare providers, assisting management of patients during this pandemic.
