A case of hyperthyroidism, which developed in a patient affected by thyroid carcinoma a few days after thyroidectomy, is described. The symptomatology was caused by a bone metastasis at the left ischiopubic branch, which had a high iodine-uptake capacity and was sensitive to metabolic radiotherapy. Pulmonary metastases were also present; they had a distinct low affinity for iodine and showed no response to repeated administrations of 131I. The case is evaluated on the basis of the evolution of the clinical picture and the hormone dosages administered in a follow-up period of 3 years.
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