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SAMJ: South African Medical Journal

On-line version ISSN 2078-5135
Print version ISSN 0256-9574

SAMJ, S. Afr. med. j. vol.105 n.7 Pretoria Jul. 2015

http://dx.doi.org/10.7196/SAMJNEW.7885 

RESEARCH

 

Nodular thyroid disease and thyroid malignancy: Experience at Polokwane Mankweng Hospital Complex, Limpopo Province, South Africa

 

 

M M Z U BhuiyanI; A MachowskiII

IFRCSG, MMed; Department of General Surgery, Polokwane Mankweng Hospital Complex and Faculty of Health Sciences, University of Limpopo, Polokwane campus, Limpopo Province, South Africa
IIMD, PhD; Department of General Surgery, Polokwane Mankweng Hospital Complex and Faculty of Health Sciences, University of Limpopo, Polokwane campus, Limpopo Province, South Africa

Correspondence

 

 


ABSTRACT

BACKGROUND: Nodular thyroid disease is common throughout the world. Numbers of patients with goitre are increasing worldwide, as also noted in Limpopo Province, South Africa (SA). Globally, thyroid nodules have been reported in 4 - 7% of the population on neck palpation and in 30 - 50% by ultrasonography.
OBJECTIVES: To review the profile of thyroid disease in patients with goitre presenting to the Department of Surgery at Polokwane Mankweng Hospital Complex (PMHC), Limpopo, SA, to characterise the pattern of malignancy in patients with goitre, and to determine the most common thyroid cancer.
METHOD: A 6-year retrospective study (2003 - 2008) of all patients with thyroid nodules who underwent thyroid surgery at PMHC.
RESULTS: The study group included 90 patients (mean age 45 years, range 4 - 80). The male-to-female ratio was 1:17 (5 men, 85 women). Of these patients, 80 (89.9%) had benign lesions, of which 52 (57.8% of the total) were adenomas, 25 (27.8%) multinodular goitres (MNGs), 2 (2.2%) hyperplastic nodules and 1 (1.1%) Hashimoto's thyroiditis. Ten patients (11.1%) had malignant lesions (7 follicular carcinomas and 3 papillary carcinomas), of which 2 were found in MNGs.
CONCLUSIONS: Adenoma and MNG were the predominant non-malignant conditions (85.6%). The prevalence of thyroid cancer in our study was 11.1%, and of all 90 patients, 7.8% had follicular carcinoma. The risk of malignancy in MNG was 8.9%. Rates of thyroid nodules and carcinoma were highest in women aged 41 - 60 years. We advocate that total thyroidectomy be considered for MNG, because MNG can harbour incidental carcinoma
.


 

 

Nodular thyroid disease is common throughout the world, and the incidence has been rising in recent decades. Worldwide, thyroid nodules have been reported in 4 - 7% of the population on neck palpation and in 30 - 50% when investigated by ultrasonography.[1,2] Usually patients with nodular thyroid disease present to a surgical clinic with a neck mass, with or without toxic symptoms, with pressure symptoms or for cosmetic reasons. Treatment options depend on the cause and the clinical presentation and include medication, radioactive iodine and surgery.

Thyroid nodules can be benign (adenoma, nodules of multinodular goitres (MNGs), or localised thyroiditis, including autoimmune disease and cysts) or malignant (papillary adenocarcinoma, follicular adenocarcinoma, medullary carcinoma, undifferentiated carcinoma or lymphoma).

In the hands of experienced surgeons, surgery for nodular thyroid disease has low mortality and morbidity.[3] Operations include lobectomy/hemithyroidectomy, subtotal thyroidectomy and total thyroidectomy.

There has been no formal study on these diseases in Limpopo Province, South Africa (SA), which has a population of 5.5 million.

 

Objectives

To review the profile of thyroid disease in patients with goitre who presented to the Department of Surgery at Polokwane Mankweng Hospital Complex (PMHC), tertiary hospitals in Limpopo, to characterise the pattern of malignant disease in patients presenting with goitre, and to determine the most common thyroid cancer in the Limpopo population study group.

 

Methods

A 6-year retrospective study (2003 - 2008) of all patients with thyroid nodules who underwent thyroid surgery at PMHC was done. All the patient files were reviewed, and cases in which histological results were not available were excluded. Data were collected from the theatre and hospital information systems, the National Health Laboratory Service and the patient files.

 

Results

Of 117 patient files, 27 lacked histological results and were excluded from the study. The study group therefore consisted of 90 patients, ranging in age from 4 to 80 years (mean 45); 85 (94.4%) were women and 5 men (5.6%) (male-to-female ratio 17:1).

Thyroid function tests were done in all cases, ultrasound scans in 42, isotope nuclear scans in 59 and fine-needle aspiration cytology (FNAC) in 11. The histopathological diagnoses in all 90 patients are shown in Table 1. Indications for surgery were cosmetic reasons, suspected malignancy, and compression of adjacent areas.

 

 

Surgical operations included 53 lobec-tomies, 31 subtotal thyroidectomies and 6 total thyroidectomies. There were no operative deaths. Ten patients (11.1% of the total) had malignant lesions (7 follicular carcinomas and 3 papillary carcinomas). There were 80 patients (88.9%) with benign lesions, of which 52 (57.8% of the total) were adenomas, 25 (27.8%) MNGs, 2 (2.2%) hyperplastic nodules and 1 (1.1%) Hashimoto's thyroiditis. Two papillary carcinomas were foundin MNGs (8.0% of MNGs).

Of all the patients, 7.8% had follicular carcinoma (7 cases). Adenomas and MNGs were the most common non-malignant conditions, occurring in 77 patients (85.6%). In our study, thyroid nodules, whether benign or malignant, occurred more frequently in women (94.4%) than in men. The age group most affected was 41 - 60 years (Table 2).

 

 

 

Discussion

The prevalence of thyroid nodules is rising globally. According to the World Health Organization, at least 1.6 billion people are at risk of iodine deficiency disorders, and of these 655 million are affected by goitre.[4] Most thyroid nodules are benign. The worldwide prevalence of MNG in the general population is estimated to be 4 - 7%, and these lesions are often caused by iodine deficiency.[5] The incidence of thyroid malignancy ranges from 0.9% to 20.5% in different parts of the world. [6,7] Globally, the most common thyroid cancer is papillary carcinoma.[8,9] Follicular carcinoma, while relatively less frequent, is reported to be more common in iodine-deficient areas where MNG is endemic.[10-17]

Thyroid cancer is the most common endocrine carcinoma, and the risk factors for malignancy are age <30 or >60 years, male gender (8% males v. 4% females),[2,18] and a history of irradiation to the head and neck.[19]

Limpopo Province is located far from the sea, and the iodine content in the diet is low. Our 11.1% rate of thyroid cancer in Limpopo is consistent with the literature.[6,7] In our study, the predominant thyroid cancer was follicular carcinoma (7.8% of patients), comparable to reports from Durban and Burkina Faso.[20-22] The two cancers in MNGs in our study were papillary carcinomas. The risk of malignancy in cases of MNG in our study was 8.9%, similar to findings reported in the literature of 2 - 12%.[6,8,10,23-27] Although there were few males in our study, figures indicate that men are at twice the risk of developing cancer compared with females. FNAC was not reliable in Limpopo; as a result we could not use it regularly, so it is difficult to draw conclusions in this regard. Cytology reports for our 11 patients who underwent FNAC fell into categories 1 - 3 of the Bethesda classification.[28] On histological examination, these lesions were found to be non-malignant. The value of FNAC in thyroid cancers and thyroid nodules is well established,[29-31] including at PMHC. It is known that the rate of false-negative results for FNAC ranges from 0.7% to 2.2% if ultrasound-guided FNAC is used,[32,33] the rate rising to 44.7% without ultrasonography.[10,21,34-39] FNAC significantly reduces the number of unnecessary operations,[30,31,40] but the problem of its missing malignant lesions remains unsolved.

Five of our 59 patients who had isotope nuclear scans were suspected to have a malignant lesion, but in only one case was carcinoma histologically confirmed, which is similar to previously reported findings.[41] Radioisotope investigations for malignant disease have an important role, but only if they are taken together with clinical findings and other investigations such as ultrasonography, FNAC, computed tomography, magnetic resonance imaging or positron emission tomography.[7,42]

Benign thyroid disorders are common, and often affect younger females. Subtotal thyroidectomy/hemithyroidectomy are the surgical procedures most frequently offered.[21,43,44] In our study the majority of patients were females, in whom benign conditions predominated; the operations performed were either lobectomy or subtotal thyroidectomy.

The approach to the surgical management of benign goitre is progressively becoming more radical owing to the risk of recurrent goitre'31 and the safety of surgery.[30,45-48] Furthermore, the rate of incidental malignancy in MNG is high (8.9% in our study), and re-operation for recurrent goitre following subtotal thyroidectomy is associated with a significantly increased risk of permanent recurrent laryngeal nerve injury.[48]

 

Conclusions

Adenoma and MNG were the most common non-malignant conditions in our study (85.6%). The prevalence of thyroid cancer in our study was 11.1%, and of all the lesions 7.8% were follicular carcinomas. Malignant lesions were found in 8.9% of patients with MNG. We advocate that total thyroidectomy be considered for MNG because of the risk of incidental carcinoma.

Acknowledgements. We are grateful to Dr B Interewicz and Mrs Maggi Landman for their contribution to data collection, and to Dr F L M Hyera

for his valuable comments on this manuscript. We thank Mr S Ntuli for statistical assistance.

 

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Correspondence:
M M Z U Bhuiyan
bhuiyanmirza@gmail.com

Accepted 3 April 2015.

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