Figure 1. 67-year-old male smoker with squamous cell carcinoma (16 mmx16 mm) in the apical segment of the right lower lobe, with hilic growth pattern. (a) Low dose CT shows a small nodule (arrow). (b) High resolution CT shows a homogeneous solid tissue density nodule (arrow). (c) Histopathological examination of the tumour shows hilic (solid) tumour growth (H&E stain; original magnificationx1.25). (d) Close-up view of the posteroanterior chest radiograph shows the lung nodule (arrow). (e) Optical densitometric measurement of visible tumour on the chest radiograph. The contrast and gradient values are 0.21 OD and 0.11 OD mm^-1, respectively, which corresponds to the histopathological findings of hilic tumour growth.