Fig. 9.

Lung cancer of the left hylum in a 67-year-old man with history of sarcoidosis. (a) Axial low-dose CT image through lung hyla does not show any significant findings at baseline CT screening. (b) Low-dose CT image obtained at the same level 1 year later shows the appearance of a 6-mm pulmonary nodule (arrow) surrounded by vascular and airways structures of the left hylum. This finding without contrast material injection can be misinterpreted as a pulmonary vessel. (c) The following year, the low-dose CT scan reveals the presence of a large lesion of the left hylum (arrows) that was characterize by increased metabolic activity via PET scan (d). The histological diagnosis was a T2N1 squamous cell carcinoma