Mild hyperthyroidism for four years with symptoms associated with tachycardia and heat intolerance. In the past she has refused surgery and was delighted to learn about thyroid RFA as an option. She has a visible left thyroid nodule which is over 4.72 cm in largest dimension and 12.5 ml in volume. The patient has had an I-123 iodine uptake scan in the past which identifies this lesion is an autonomous (toxic) nodule.