Fig. 2
Representative example of the measurement of metabolic parameters on FDG-PET/CT for primary tumor and LNs. Primary tumor with an SUVmax of 17.21, MTV3.5 of 165.81 cm3, and TLG3.5 of 1323.29; #4R LN with an SUVmax of 8.65, MTV3.5 of 1.04 cm3, TLG3.5 of 5.21, and LPR of 0.5. In the pathological report, the LN was diagnosed as positive. FDG-PET/CT, fluorine-18-fluoro-2-deoxy-D-glucose-positron emission tomography; LN, lymph node; SUVmax, maximum standardized uptake value; MTV, metabolic tumor volume; TLG, total lesion glycolysis; LPR, lymph node-to-primary tumor ratio of SUVmax