Accumulation of technetium-99m pertechnetate in a patient with metastases of thyroid carcinoma

Accumulation of both Tc-99m pertechnetate and radioiodine upon scintigraphy in thyroid carcinoma and/or in its metastases is a rare occurrence. In thi s paper we describe a patient who was taken to surgery for left lobectomy o f the thyroid with follicular adenocarcinoma and who had accumulation of bo th I-131 and Tc-99m pertechnetate in lung metastases. The accumulation of I -131 was less than that of Tc-99m pertechnetate. The use of Tc-99m pertechn etate for imaging for diagnosis of functioning thyroid metastases is discus sed.