The coincidence of hyperthyroidism and thyroid carcinoma seldom occurs. Onl
y few reports on functionally metastases of thyroid carcinoma have been pub
lished. We report a 59-year-old man who underwent subtotal thyroidectomy fo
r toxic nodular goiter. Histological examination revealed a follicular thyr
oid carcinoma. After thyroidectomy and cervical lymphadenectomy the patient
developed a strong hyperthyreosis. Scintigraphy showed strong radioiodine
uptake in the sacrum. De-bulking resection of the metastasis followed by hi
gh-dose radioiodine treatment was performed. After radioiodine therapy the
patient became euthyroid. Treatment of hyperthyreosis in metastatic thyroid
cancer requires a multimodal therapeutic concept.