Figure 6b. CT images from a 7-year longitudinal study in a 41-year-old quitter (20.0 pack-years at T0). (a) Transverse thin-section CT scan targeted to the right lung at T0 shows faint parenchymal micronodules (arrowheads) in the upper lung zones. (b) Transverse thin-section CT scan obtained at the same level as a at T1 shows considerable reduction in the profusion of ill-defined micronodules (arrowheads).