Microscopic thyroidectomy: a prospective controlled trial

The purpose of this prospective study was to evaluate microsurgical thyroidectomy by comparing it with traditional thyroidectomy. Before surgery, patients were assigned either to the microscopic thyroidectomy group (MT group), with the use of the surgical microscope, or the traditional thyroidectomy group (TT group), without the use of visual magnification. Outcome measures were operative time, intraoperative bleeding and complication rates including injury to the recurrent laryngeal nerve (RLN), the external branch of the superior laryngeal nerve (EBSLN) or the parathyroid glands. Ninety-eight patients underwent thyroid surgery (58 patients in the MT group, 40 patients in the TT group). The two groups were similar in age, sex, surgical procedures and histological findings. There was no difference between the two techniques regarding the operative time and the amount of blood loss. Neither permanent nerve palsy nor persistent hypocalcemia occurred in either group. Transient nerve palsies (RLN and EBSLN) were lower in the MT group (1.7%) compared to the TT group (7.5%), but the difference did not reach statistical significance (P>0.05). Overall transient hypocalcemia was significantly lower in the MT group (1.7%) compared with the TT group (12.5%, P=0.032). If the population was restricted to total thyroidectomy, the rate of transient hypocalcemia was 4.1% in the MT group and 33.3% in the TT group, respectively (P=0.022). In conclusion, microsurgical thyroidectomy is a feasible and efficacious surgical procedure. It significantly reduces the complications without increasing the operating time in thyroid surgery procedures. A major advantage of this technique is the possibility of attaching a camera to the microscope, thereby greatly facilitating teaching.