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:
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.