Fig. 1

Ichikado pulmonary zones. The upper zone is defined as the lung parenchyma above the carina, the middle zone as the area between the carina and the pulmonary vein, and the lower zone as the infrapulmonary vein area. A Coronal lung window of CT chest showing all 6 Ichikado pulmonary zones. B Sagittal lung window of CT chest showing right lung Ichikado areas. C Axial lung window of CT chest showing right and left middle zones. This example shows images of a 34-year-old lady with coronavirus disease 2019