Figure 1. Schematic representation of the RSNA classification. The upper left image shows “typical” CT findings of COVID-19 with multifocal rounded ground-glass opacities. The lower left image shows an “indeterminate” CT findings of COVID-19 with perihilar bilateral opacities and a lack of “typical” tomographic findings. The lower right image shows “atypical” CT findings of COVID-19 with lower lobe consolidation and bilateral “tree-in-bud” images. The upper right image shows “negative” CT findings without signs of infection. COVID-19, Coronavirus disease; CT, computed tomography; RSNA, Radiological Society of North America.