Chest CT Diagnostic classification system: Classical COVID

The British Society of Thoracic Imaging (BSTI) guidelines (attached below) have outlined features that define Classical COVID:

Lower lobe predominant, peripheral predominant, multiple, usually bilateral foci of GGO, Plus or minus the following:

  • Crazy-paving
  • Peripheral consolidation
  • Air bronchograms
  • Reverse halo/ perilobular pattern (organising pneumonia pattern)

Radiological Society of North America (RSNA) guidelines (attached below) have outlined features that define Typical COVID:

  • 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

The RSNA have also provided some guidance on structuring CT reports for Typical COVID:

“Commonly reported imaging features of (COVID-19) pneumonia are present. Other processes such as influenza pneumonia and organizing pneumonia, as can be seen with drug toxicity and connective tissue disease, can cause a similar imaging pattern.”

Chest CT Scan Classification in COVID-19

Chest CT Diagnostic classification system: Probable COVID

Mark as Understood

Resources

Thoracic Imaging in COVID-19 Infection (BSTI)

RSNA Expert Consensus Statement on Reporting Chest CT Findings Related to COVID-19

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