A 7- to 8-cm diffuse toxic goiter with associated symptoms of hyperthyroidism developed in a 38-year-old black female undergoing regular hemodialysis for renal failure. Our treatment of choice was an ablative dose of radioactive iodine in the form of sodium iodide (Na-131I). To our knowledge, this is only the 4th documented case of hyperthyroidism in a patient with renal failure. Detailed monitoring of 131I radioactivity in the blood, thyroid gland and the dialysate demonstrated that there was no radiation hazard to personnel involved in the patient management.
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