本文報告一功能性甲狀腺濾泡癌轉移至肝臟的病例。患者74歲男性，25年前(1978年)便曾因多發緎甲狀腺結節合併甲狀腺高能症而接受部份甲狀腺切除術; 2002年4月，病患又出現腹瀉、雙手顫抖、全身無力等症狀，經抽血、甲狀腺造影、超音波及腺體空刺細胞學檢查證實為甲狀腺濾泡癌合併甲狀腺高能症，因此接受全甲狀腺切除術。術後12週，甲狀腺功能檢查包括T3、T4及TSH均仍維持在正常範圍內，口服碘-131 60 mCi治療後的全身掃描結果顯示: 頸區甲狀腺基部、肺臟、肝臟及脊椎骨等處均有不正常的放射性碘活性聚集，尤以肝臟最為明顯。

　　　　　 A 74-year-old male patient was referred to our department for 131I thyroid ablation therapy. He had undergone partial thyroidectomy for multinodular goiter of thyroid with hyperthyroidism about 25 years before and total thyroidectomy for follicular carcinoma of thyroid in October 2002. Twelve weeks after total thyroidectomy, thyroid function tests including free thyroxine (FT4), triiodothyronine (T3) and thyrotropin (TSH) all showed within normal values. 131I with a dose of 60 mCi was administrated and the whole-body scintigraphy of 131I demonstrated a large area of intense radioiodine uptake in the right lobe of liver, as well as multiple areas of radioiodine uptake in anterior neck region, right lung and thoracic-lumbar spine. The data were consistent with the diagnosis of functioning liver metastasis from follicular carcinoma of thyroid.