Anatomical Positions of Superior Parathyroid Gland with regard to the Zuckerkandl Tubercle in Patients Undergoing Thyroidectomy in a Tertiary Care Centre: A Descriptive Cross-sectional Study.

Introduction: Zuckerkandl tubercle is a prominent anatomical structure of the thyroid lobe. Identification and preservation of recurrent laryngeal nerve and parathyroid glands during thyroid surgery can be made easier through assessment of their relationship with the Zuckerkandl tubercle. This study aims to determine the anatomical relationship between Zuckerkandl tubercle and superior parathyroid in patients who underwent thyroidectomy in a tertiary care center.

Methods: This descriptive cross-sectional study was conducted at a tertiary care hospital of Nepal following ethical clearance from the Institutional Review Committee (Reference no: 0106201804) among patients who underwent thyroid surgery between July 2018 to February 2020. Convenience sampling was used for collecting data and was entered in Statistical Package for the Social Sciences version 20. Point estimate at 95% confidence interval was calculated along with frequency andproportion for binary data.

Results: Out of 59 cases, 27 (96.4%) of superior parathyroid on the left were at the 1-2 o'clock position, and 28 (90.3%) of superior parathyroid on the right were at 10-11 o'clock position. On the left side, the superior parathyroid was adhered to Zuckerkandl tubercle in 10 (35.7%), was within 5 mm in 16 (57.1%), and was >5 mm away from Zuckerkandl tubercle in 2 (7.14%). On the right side, the superior parathyroid was adhered to Zuckerkandl tubercle in 12 (38.7%), was within 5 mm in 13 (41.93%), and was >5 mm away from Zuckerkandl tubercle in 6 (19.3%).

Conclusions: Zuckerkandl tubercle has a consistent relationship with the superior parathyroid and can be used as an important landmark for identifying superior parathyroid during thyroid surgery.