Fig. 1

Chest X-ray and computed tomography (CT). a Chest X-ray on admission showing a solitary nodule in the left middle lung field. b Chest CT on admission showing a 12-mm nodule with a cavitary lesion and a centrilobular branching structure (tree-in-bud appearance) in the lower lobe (S⁶) of the left lung. c Chest X-ray 9 months after treatment initiation showing decreased size of the solitary nodule in the left middle lung field. d Chest CT 9 months after treatment initiation showing a XX-mm nodule diminishing the tree-in-bud appearance