In patients with DTC, 18F-FDG PET/CT can be very useful to detect residual, recurrent, or metastatic disease, especially in the presence of elevated levels of serum thyroglobulin with negative RAI whole-body scan; stimulation by THW or rhTSH may improve the performance of 18F-FDG PET/CT scan in this context, in particular for low-volume disease [20]. Here, TG is linked to metastatic neoplasm.