TG and neoplasm: According to the American Thyroid Association recommendations (7), the disease-free status comprises all of the following: i) No clinical evidence of tumour; ii) no imaging evidence of tumour [i.e. no uptake outside the thyroid bed on the initial post-treatment whole-body scan (WBS) or, if uptake outside the thyroid bed is present, no imaging evidence of tumour on a recent diagnostic scan and neck ultrasound (US) is observed]; and iii) undetectable serum thyroglobulin (Tg) levels during thyroid-stimulating hormone (TSH) suppression and stimulation in the absence of interfering antibodies.