Figure 2. 56-year-old male smoker with a well differentiated type A adenocarcinoma (11 mmx12 mm) in the apical segment of the right lower lobe, with lepidic growth pattern. (a) Low dose CT shows a small faint lesion (arrow). (b) High resolution CT shows a ground-glass attenuation nodule through which the small vessels are visible (arrow). (c) Histopathological examination shows alveolar lining tumour growth without alveolar collapse (H&E stain; original magnificationx1.25). (d) Close-up view of the posteroanterior chest radiograph shows no evidence of the nodule in the middle zone of the right lung field.