Fig. 6.

If the SUVmax is ≤5.96, the CV value should also be considered. If the CV is ≤0.20, a benign process is suspected. If the CV is >0.20, then measurement of the diameter will be helpful. A diameter >1.5 cm indicats metastasis; otherwise (≤1.5 cm) a benign process is more likely. a FDG-avid right lower paratracheal LN was observed with an SUVmax of 5.43 (under the cutoff value), but CV was 0.30 with a diameter of 1.6 cm (HUmax was 113) indicating metastatic process. Pathologic finding confirmed as metastatic adenocarcinoma. This 76-year-old man had primary adenocarcinoma of right upper lobe of lung. b FDG-avid right interlobar and hilar LNs adjacent to the adenocarcinoma lung lesion were observed with SUVmax of 5.06 and 3.27. CV values were below 0.20 (0.15 and 0.15) indicating benign process in keeping with pathologic findings. Diameter of both LNs also indicated benign process (1.5 and 1.5 cm). HUmax values were 115 and 142