The risk of hypoparathyroidism after central compartment lymph node dissection in the surgical treatment of pT1, N0 thyroid papillary carcinoma.

OBJECTIVE The role of central compartment lymph node dissection (CCLND) in the treatment of papillary thyroid carcinoma (PTC) is still controversial. The benefits of CCLND should be weighed against its potential risks. We aim to evaluate the positivity of central lymph nodes in pT1, N0 PTC and to establish the complication rates of total thyroidectomy (TT)+CCLND. PATIENTS AND METHODS This is a retrospective study on prospectively collected data over a 45-month period. A total of 329 patients were included. Total thyroidectomy was performed in 130 (39.5%) of these patients due to benign thyroid pathologies, and 199 (60.5%) pT1, N0 PTC patients had TT+CCLND. Our TT technique was applied in the same way in both groups. Central lymph node positivity, the number of lymph nodes removed during CCLND and the operative complications were evaluated. T-test and chi-square analysis were conducted in independent groups for statistical evaluation. RESULTS The rate of central lymph node positivity in TT+CCLND group was 38%. The average number of lymph nodes removed by CCLND is 10.2 (1-36). Complication rates between TT and TT+CCLND groups were statistically significant (3.8% vs. 11.1%, respectively) (p<0.05). The difference was found to be particularly more pronounced for transient hypocalcemia. Although there was no significant relation between the number of lymph nodes removed during CCLND and the number of parathyroid glands detected in the pathology specimens (p>0.05), the relation between the development of symptomatic hypocalcemia and the number of the parathyroid glands removed during surgery was significant (p <0.05). CONCLUSIONS Central compartment lymph node metastasis in PTC is common. CCLND may increase the rate of transient hypocalcemia.