Fig. 5
70-year-old female with invasive adenocarcinoma in the right upper lobe, STAS (+). Axial CT in the lung window (a) and axial chest thin-slice CT (d) show that the solid nodule is about 1.5 × 2.0 cm with lobulation, spiculation, vessel convergence and bronchial truncation. Axial PET (b) and axial fused PET/CT (c) show the SUVmax of the lesion is 7.2 g/ml. In photomicrograph (hematoxylin-eosin stain, magnification × 400) (e), tumor tissues (black arrow) are observed within air spaces in the surrounding lung parenchyma adjacent to the boundary (dashed line) of the bulk of the tumor (triangle). STAS, tumor spread through air spaces; SUVmax, the maximum standardized uptake value