The value of [18F]FDG PET/CT in avoiding overtreatment of 131l avidity pulmonary metastasis of differentiated thyroid cancer.

We concluded that higher [18F]FDG uptake and larger tumour size predict poor therapeutic effects and a high risk of disease progression in ¹³¹I-avid PMs of DTC. For evaluating the efficiency of ¹³¹I treatment, per-lesion analyses and assessing the data of [¹⁸F] FDG PET/CT would be more reliable than per-patient evaluation only. And early focal treatment modalities may improve their life span.