TG and differentiated thyroid carcinoma: Differentiated thyroid carcinoma (DTC) is usually characterized by a papillary and/or follicular pattern well represented on histologic examination and it has a very good prognosis, with an overall risk of relapse that never exceed 20%.[1,2] Follow-up in patients with DTC consists of periodically measurements of serum thyroglobulin (Tg), Tg antibodies and neck ultrasound while diagnostic radioiodine whole body scan (d-WBS) is useful in patients with high or intermediate risk of persistent disease.