Fig. 4

A 46-year-old female who had close contact with people in Wuhan presented fever for 1 day. a Axial-view chest CT shows ground-glass opacities in the upper right lobe with clear margins and visible interlobular septal thickening inside, forming the “crazy paving sign” (red arrow). b Follow-up axial-view chest CT scan 3 days after the first one shows that the scope of lesions increases significantly, and the lesion density also increases, along with significant thickening of the intralobular and interlobular septa (red arrow)