Fig. 1

The transition of the patient’s CT imaging. A–D, F Axial CT images on day 28 (A), day 41 (B), day 53 (C), day 61 (D), and day 71 (F). A A nodule in the peripheral region of the right upper lobe (arrowhead). B Enlargement of the nodule with newly emerged cavitation in the right upper lobe (arrowhead). C A new nodule emerges in the left upper lobe (arrow). D The nodule in the left upper lobe is enlarged with cavitation (arrow), whereas the nodule in the right upper lobe is diminished (arrowhead). E A coronal CT image on day 61. The nodular lesion in the left upper lobe shows cavitation with the halo sign. F Rapid growth of the nodule in the left upper lobe (arrow)