Figure 1
The undetectable nodule. 18 F-FDG PET-CT (June 2010): CT (a) and fused (b) axial images. Focal 18 F-FDG uptake is evident in the subpleural parenchyma of the apical segment of the right lower lobe. (c) Contrast-enhanced CT axial image (June 2010): no significant alterations in the site of 18F -FDG uptake. (d) Contrast-enhanced CT axial image (January 2011): a pulmonary nodule of 1 cm in the apical segment of the right lower lobe, corresponding to the site of 18F -FDG uptake is revealed. 18 F-FDG PET-CT (April 2011): CT (e) and fused (f) axial images. Clear evidence in the apical segment of the right lower lobe of a pulmonary nodule characterized by intense metabolic activity.