Fig. 6.

Slow-growing lung adenocarcinoma in a 61-year-old man. (a) Low-dose CT axial section in the right upper lobe shows a 6-mm ground-glass nodule (arrow). (b) Low-dose CT scan after 2 years shows an increase in size of the nodule to 10 mm (arrow). (c) After 4 years from the first low-dose CT scan, the nodule showed the same ground-glass attenuation but a progressive increase in size from 10 to 14 mm (arrow). Typically, early lung cancer presenting as non-solid nodules are slow-growing forms