Acun Z, Comert M, Cihan A, Ulukent SC, Ucan B, Çakmak GK. Near-Total Thyroidectomy Could Be the Best Treatment for Thyroid Disease in Endemic Regions. Arch Surg. 2004;139(4):444-447. doi:10.1001/archsurg.139.4.444
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Near-total thyroidectomy, on the basis of its low morbidity rate, is an appropriate treatment option in the surgical management of various thyroid diseases in an endemic region in Turkey.
Single-institution study of patients with various thyroid diseases treated by means of near-total thyroidectomy within 2 years in an endemic region, with comparison of the results vs the complication rates of bilateral subtotal and total thyroidectomy reported in the literature.
Tertiary academic referral center.
One hundred fifty-two patients who underwent near-total thyroidectomy for various thyroid diseases.
Main Outcome Measures
Surgical treatments of various benign thyroid diseases were compared according to the complication rates and the achievable benefits of the procedures.
In our clinic, near-total thyroidectomy was the principal surgical procedure performed for benign thyroid disease. The temporary recurrent laryngeal nerve palsy rate with respect to the nerves at risk was 3.3% (10 of 304 nerves), whereas temporary hypoparathyroidism was 7.2% (11 of 152 patients). Neither permanent recurrent laryngeal nerve palsy nor permanent hypoparathyroidism occurred. In 1 patient, wound hematoma developed and required re-exploration. Seroma in another patient needed no medical or surgical intervention. Neither wound infection nor mortality were noted.
Near-total thyroidectomy achieves a lower complication rate of hypoparathyroidism and a similar complication rate of recurrent laryngeal nerve palsy and recurrence when compared with the rates reported in the literature for total thyroidectomy. It is an effective and safe surgical treatment option for various benign thyroid diseases.
Health problems related to the thyroid gland are common. Goiter prevalence is reported to range from 5% to 56% in Turkey.1 Many treatment modalities have been described for the surgical management of various thyroid diseases, including excision, bilateral subtotal thyroidectomy, near-total thyroidectomy, and total thyroidectomy. However, the use of surgery should always be based on the achievable benefits of the procedure and outweigh the potential complications. All of the treatment alternatives achieve different kinds and incidences of morbidities. As a result, most surgeons have been looking for a treatment that results in the least recurrence and lowest complication rate. Total thyroidectomy for management of benign thyroid disorders is increasingly accepted, although the indications are not well defined.2- 6
An important disadvantage of total thyroidectomy is the high incidence of hypocalcemia due to parathyroid gland devascularization.7 A low complication rate is the advantage of subtotal thyroidectomy, but secondary thyroidectomy may be necessary because of recurrence after subtotal thyroidectomy and is associated with increased morbidity and related to recurrent laryngeal nerve injury and hypoparathyroidism resulting from parathyroid gland devascularization.8 The goal of this study is to evaluate near-total thyroidectomy as an appropriate treatment for thyroid disorders in endemic regions in Turkey because its recurrence rate is lower than that of subtotal thyroidectomy and there is a lower possibility of parathyroid damage when it is compared with that of total thyroidectomy.
Between April 15, 2001, and May 15, 2003, 152 patients with goiter who underwent surgical treatment in our clinic (General Surgery Department, Zonguldak Karaelmas University, School of Medicine, Zonguldak, Turkey) were included in this study. All patients provided informed consent. All patients were evaluated by means of physical examination, thyroid function tests, thyroid ultrasonography, and thyroid scintigraphy. Fine-needle aspiration biopsy was performed for hypoactive and dominant thyroid nodules. In our surgical department, we performed total thyroidectomy in single nodules that were suspected of malignancy at fine-needle aspiration biopsy; therefore, these patients were specifically excluded. Antithyroid medications were used for hyperthyroidism before surgery to attain euthyroidism.
Videolaryngostroboscopic examinations were performed to evaluate vocal cord motility 24 hours before surgery and 48 hours after surgery in all patients and included confirmation of normal vocal cord movement in patients who had temporary neuropraxia. Near-total thyroidectomy was performed in all cases and consisted of total lobectomy in the lobe having the dominant nodule, with isthmectomy and near-total lobectomy in the contralateral side, leaving a small quantity of about 2 g of thyroid tissue adjacent to the parathyroid glands and their blood supply. Recurrent laryngeal nerves in all cases were identified and traced to the cricoid cartilage in either side. Every attempt was made to demonstrate and preserve all of the parathyroid glands with their blood supply. When a parathyroid gland was damaged, it was transplanted into the sternocleidomastoid muscle.
In each patient, serum calcium and phosphorus levels were checked on the first and second postoperative days. Hypocalcemia is defined as low ionized serum calcium levels and the presence of symptoms of hypocalcemia. We considered hypocalcemia temporary when it lasted about 3 to 6 weeks after surgery. Calcium levels were followed up in patients who were temporarily hypocalcemic and who needed calcium supplements.
There were 113 female and 39 male patients, with a mean age of 43 years (range, 24-77 years). We performed near-total thyroidectomy in all patients; the various indications are summarized in Table 1. The clinical signs in these patients are summarized in Table 2. Sixty-six patients were treated medically because of hyperthyroidism to achieve euthyroidism preoperatively. Thyroid scintigraphy depicted hypoactive nodules in 73 patients. Fine-needle aspiration biopsy was performed in 87 patients, and the results were neither suspected nor malignant histopathologically. Intraoperative frozen section evaluations were used for nodules suspected of being malignant that had not been suspected of being malignant preoperatively; there was no malignancy at frozen section evaluation. Parathyroid autotransplantation was performed in 7 patients, and none developed temporary or permenant hypoparathyroidism.
Postoperative complications are summarized in Table 3. The temporary recurrent laryngeal nerve palsy rate with respect to the nerves at risk was 3.3% (10 of 304 nerves), whereas temporary hypoparathyroidism was 7.2% (11 of 152 patients). Neither permanent recurrent laryngeal nerve palsy nor permanent hypoparathyroidism occurred. Wound hematoma developed in 1 patient and required re-exploration. Seroma in another patient needed no medical or surgical intervention. Five papillary carcinomas in 4 female patients and 1 male patient were diagnosed by using paraffin blocks. We performed iodine I 131 ablation in these patients. Neither wound infection nor mortality was noted.
The surgical treatment of benign thyroid disease is still controversial. Many treatments have been described for the surgical management of multinodular goiter, including unilateral or bilateral subtotal thyroidectomy, hemithyroidectomy, near-total thyroidectomy, and total thyroidectomy. Despite numerous studies of operative strategies, we still do not have clear evidence about which option is the best. When the disorder affects both lobes, total or near-total thyroidectomy is mandatory, especially in younger persons, to obviate suppressive therapy and possible relapse. Subtotal thyroidectomy may be the best elective procedure in older patients to avoid total and permanent dependence on drugs.9 Some authors favor the subtotal procedure in the treatment of benign multinodular disease because of its lower incidence of iatrogenic injuries such as recurrent nerve palsy and hypoparathyroidism and the supposed autonomous euthyroidism requiring no medical intervention.7 Other authors advocate total thyroidectomy because the incidence of iatrogenic injuries is similar to that of the subtotal procedure, and there is no risk of recurrence.10- 12
Recurrence that requires further resection is a relevant factor in the choice of operation. It is difficult to evaluate the results of thyroid surgery for benign disease mainly because of the long follow-up required for complete assessment of the outcome when there may be a delay of 20 or 30 years before recurrence.13 According to our review of the literature, recurrence develops in as many as 14.5% of cases after subtotal resection, despite drug prophylaxis; without suppressive therapy, the rate of recurrence increases to 43%.6,14 Ambrosi et al15 found that recurrence was inversely related to the extent of resection. Piraneo et al14 reported a 39% recurrence rate after enucleation, 27% after lobectomy, 20% after lobectomy and contralateral enucleating excision, and 4% after subtotal resection. Recurrence rates after subtotal thyroidectomy vary as much as 14%.16 Recurrence after subtotal thyroidectomy compels patients to undergo secondary thyroidectomy.
When compared with primary thyroid surgery, secondary thyroidectomy has an increased risk of complications, such as recurrent laryngeal nerve injury and hypoparathyroidism.8 The best means of diminishing the complication rate is prevention through excising all pathologically altered tissue.17- 19 Simple excision of a nodule or subtotal unilateral lobectomy should no longer be recommended in primary thyroid surgery. For diffuse multinodular goiter, the thyroidectomy must be sizable because the rate of recurrence is greater than 10% after 10 years and is directly related to the size of the thyroid remnant.14,20 The risk of damaging the recurrent laryngeal nerve is far higher during a second intervention because of the anatomic disturbance with scar tissue left behind after the first operation and degenerative changes.21 High rates of temporary (15.5%-23.6%) and permanent (2.6%-15.5%) damage of the recurrent laryngeal nerve have been reported in secondary thyroidectomy.22,23
The indications for total thyroidectomy for managing benign thyroid disorders are not well defined; in fact, they are evolving.22,24 If a patient had an indication for total thyroidectomy that was described in the literature (ie, history of head and neck irradiation, a multinodular thyroid gland that grossly involves both lobes, locally advanced disease with compressive symptoms, and nodules highly suspected of being malignant), we performed total thyroidectomy. In our surgical department, we have a fairly low rate of indications for total thyroidectomy. In most patients, we performed near-total thyroidectomy without suspecting malignancy; however, we found papillary carcinoma in paraffin blocks for 5 patients and performed 131I ablation. An advantage of near-total thyroidectomy over subtotal thyroidectomy is that the thyroid remnant of about 2 g renders it accessible to 131I ablation if cancer is found in the specimen and obviates reoperation for completion thyroidectomy.25
Permanent or temporary hypoparathyroidism is a well-known complication of total thyroidectomy. Excision of parathyroid glands and vascular insufficiency are the main causes of this complication. Although we would have liked to compare complication ratios between total thyroidectomy and near-total thyroidectomy in our surgical department, it was not appropriate because we had an insufficient number of patients who underwent total thyroidectomy. To compare our complication ratios, especially temporary hypoparathyroidism after near-total thyroidectomy with that after total thyroidectomy, we used reports of total thyroidectomy of both current and past authors.
According to our review of the literature, temporary hypocalcemia ranged from 24% to 35% after total thyroidectomy.2- 6,22,26,27 Even the lowest rate of temporary hypocalcemia after total thyroidectomy in the literature is nearly 3 times higher than the rate of temporary hypocalcemia in our series. The incidence of permanent hypoparathyroidism ranged from 0% to 0.2% after subtotal resection and from 0% to 3.8% after total resection.7 The incidence of permanent recurrent laryngeal nerve injuries after subtotal and total procedures varied from 0% to 1% and from 0% to 1.3%, respectively.7,24 Neither permanent recurrent laryngeal nerve palsy nor permanent hypoparathyroidism occurred in our series.
We performed near-total thyroidectomy in all of our patients. The central premise of our study is the balance of leaving a small quantity of thyroid tissue adjacent to the parathyroid glands and their blood supply to minimize the risk of complications—principally, permanent and temporary hypoparathyroidism. Identification of the parathyroid glands and meticulous surgical technique to preserve parathyroid circulation are essential during near-total thyroidectomy.
The lower rate of temporary hypoparathyroidism in near-total thyroidectomy when compared with that in total thyroidectomy is an advantage because the patients need shorter postoperative hospitalization and medical treatment. This decreased cost is particularly important in our endemic region in Turkey because we have a great number of patients and limited medical services. Near-total thyroidectomy adds the advantages of total thyroidectomy (no recurrence) to those of subtotal thyroidectomy (low incidence of temporary and permanent hypoparathyroidism). In conclusion, being aware of the advantages and disadvantages of both total and subtotal thyroidectomy, we propose near-total thyroidectomy for the surgical management of multinodular goiter in endemic regions.
Corresponding author: Zeki Acun, MD, General Surgery Department, School of Medicine, Zonguldak Karaelmas University, 67600 Kozlu, Zonguldak, Turkey (e-mail: firstname.lastname@example.org).
Accepted for publication November 4, 2003.