For all nodules for which surgery is indicated, LOBOISTHMECTOMY will be carried out with frozen sections (FS). There are three possibilities: 1) FS provides evidence of thyroid cancer. In such cases, total thyroidectomy is carried out, with dissection of the lymph nodes areas in the central (zone VI) and lateral (zones II to IV) zones on each side; 2) FS provides no evidence of malignancy. In such cases, the surgical intervention is limited to LOBOISTHMECTOMY; 3) FS shows the nodule in question to be suspect. In such cases, total thyroidectomy is not carried out before the definitive pathological results are known. It is widely accepted that recurrent dissection should also be carried out during this initial surgery. Indeed, if the definitive pathological examination shows the nodule to be cancerous, repeat surgical interventions with recurrent dissection are potentially much more damaging to the recurrent nerve.