RESUMO
Brain metastases are observed in approximately 1 percent of patients with differentiated thyroid cancer. We report a 56 years old woman subjected to a thyroidectomy due to a follicular thyroid cancer with lymph node involvement. The patient also received 79 mCi of radioiodine and levothyroxine was started. One year later a local relapse and lung dissemination was found. The patient was subjected to a surgical neck exploration and radioiodine in a dose of 250 mCi was given again. One year after this episode, a new local relapse was diagnosed and lung metastases increased in size and number. The patient presented a left hemiparesis and a brain CAT scan and magnetic resonance imaging showed multiple metastatic lesions. The patient was considered intractable and died eight months later.