A rare case of central hyperthyroidism and autonomous nodule of thyroid

A 63-year-old woman with autoimmune thyroiditis (AIT) and hyperthyroidism caused by an autonomous nodule of the left thyroid lobe was admitted to the Nuclear Medicine Department for radioiodine therapy in 2022.In 2018, AIT and concomitant focal lesions were diagnosed, laboratory tests revealed euthyroidism and increased concentration of anti-TPO antibodies (586 IU/mL; reference range, <35).After four years, elevated free thyroid hormone values were observed with