Chest CT Diagnostic classification system: Indeterminate COVID

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

  • Does not fit into definite, probable or Non-COVID
  • Manifests above patterns, but the clinical context is wrong, or suggests an alternative diagnosis (e.g. an interstitial lung disease in a connective tissue disease setting)

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

  • Absence of typical features AND
  • 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

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

“Imaging features can be seen with (COVID-19) pneumonia, though are nonspecific and can occur with a variety of infectious and noninfectious processes.”

Chest CT Diagnostic classification system: Probable COVID

Chest CT Diagnostic classification system: Non 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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