“…However, there are patients who have elevated thyroglobulin levels and a negative 131 I TBS [2]. The use of modalities, such as high-resolution ultrasonography, computerized tomography, and magnetic resonance imaging, may be helpful in the presentation of residual disease in patients having a differentiated thyroid carcinoma [3, 4, 5], especially if focused on a specific organ or area of the body indicated by previous scintigraphic procedures. Positron emission tomography with [ 18 F]fluorodeoxyglucose has been used successfully for that purpose [6, 7, 8], being, however, available only in specialized centres.…”