Vascular retention of Tc-99m pertechnetate and Tc-99m sestamibi, mimicking thyroid carcinoma metastases Retención vascular de 99m-Tc pertecnetato y 99m-TC sestamibi simulando metástasis de carcinoma de tiroides

Follicular thyroid carcinoma is common in regions with insufficient iodine diets and represents approximately 10-20 % of all thyroid malignancies1,2. The treatment of patients suffering from follicular thyroid carcinoma includes surgery and radioiodine therapy3. Although after definitive therapy, the survival of these patients is good, these patients need to be followed for local recurrences and distant metastases. The main radionuclide methods that were used for the follow-up of these patients are; Tc-99m pertechnetate, Tc-99m sestamibi, I-131 scintigraphy and F-18fluoro-2-deoxy-D-glucose (FDG) positron emission tomography (PET). These methods were found to be helpful in the identification of residual disease, but they have several non-specific uptake sites which may lead to false interpretation. Here we report a patient with false-positive findings in Tc-99m pertechnetate and Tc-99m sestamibi scintigraphy.