[Follicular carcinoma in an autonomously functioning thyroid nodule].

The patient was a 66-year-old man who complained of goiter. A diagnosis of functioning thyroid tumor was made because of high uptake of 131I after T3 suppression test and no response to thyrotropin releasing hormone. The tumor was removed and histologically proven to be follicular carcinoma. Twelve cases of thyroid carcinoma in autonomously functioning thyroid nodules have been reported, and the relation between carcinoma and an autonomously functioning nodule is reviewed from the literature.