Chest CT Scan Classification in COVID-19

COVID-19 typically presents with ground glass opacification (GGO) with or without consolidation in a peripheral, posterior, and diffuse or lower lung zone distribution. GGO has also been frequently reported to have round morphology or a “crazy paving” pattern.

Other pathologies resulting in peripheral opacities, and should be considered in COVID-19, include:

  • Viral pneumonitidies
  • Organising pneumonia
  • Eosinophilic pneumonia
  • Alveolar Sarcoid
  • Contusions
  • Pulmonary Infarcts


British Society of Thoracic Imaging (BSTI) guidelines (attached below) and Radiological Society of North America (RSNA) guidelines (also attached below) have published a classification system for COVID-19 on Chest CT scan. This table compares the two systems.

Chest CT Diagnostic classification system: Classical COVID

Mark as Understood


Thoracic Imaging in COVID-19 Infection (BSTI)

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

© Institute of Clinical Science and Technology (ICST) 2020