Comment on “Metabolic tumor heterogeneity analysis by F-18 FDG PET/CT predicts mediastinal lymph node metastasis in non-small cell lung cancer patients with clinically suspected N2”

With great interest, we read the article "metabolic tumor heterogeneity analysis by F-18 FDG PET/CT predicts mediastinal lymph node metastasis in non-small cell lung cancer patients with clinically suspected N2"(by Kisoo Pahk et al., 2018). And we would like to thank the authors for this highly useful work, which raises a few points worthy of discussion.