TANI AMAÇLI UYGULANAN İYOT-131 İLE ABLATE OLAN EKTOPİK TİROİD DOKUSU: OLGU SUNUMU

Abstract

The presence of ectopic thyroid tissue has been reported at a rate of 10% in autopsy studies. The significance of ectopic thyroid tissue among asymptomatic individuals is unknown. However, there are reports in literature suggesting an increased risk of thyroid cancer in the presence of ectopic thyroid tissue. Iodine-131 is used for detecting ectopic thyroid tissue. Screening scintigraphy is performed using low doses (2-5 mCi). Iodine-131 given for ablative purposes is approximately 6 MBq (160 μCi) per gram of thyroid gland. In this report 42-year-old woman who underwent bilateral subtotal thyroidectomy 14 years ago, with a diagnosis of diffuse toxic goiter was performed completion thyroidectomy with a diagnosis of recurrent nodular diffuse toxic goiter. At six months after the operation, midline, at the level of the hyoid bone, 12X24 mm in size, ectopic thyroid tissue was present in patient. “Atypia of undetermined significance” was reported in FNA results. The thyroglobulin level was 300 in washing samples drawn up during FNA. In order to evaluate the presence of malignancy and metastasis, wholebody scan with 3 mCi of iodine-131 was performed and only the activity accumulation leads to star artifact was observed in the neck. Ectopic thyroid tissue was not observed in the neck ultrasound performed after three months because of cytologic findings . There was no findings to suggest ectopic thyroid tissue in the thyroid scintigraphy after cessation treatment of L-thyroxine. It was concluded that thyroid tissue was ablated after application of iodine-131 treatment.