- - - Assistant Professor of Surgery, Department of General Surgery, Tuberculosis and Lung Disease Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- - - Assistant Professor of Thoracic Surgery, Department of Cardiovascular Surgery, Tuberculosis and Lung Disease Research Center, Tabriz University of Medical Sciences, Tabriz, Iran

Introduction: Due to the different results of different studies by researchers in different countries and the minimal research done in Iran, the need for this research was felt, and we decided to study this issue. The purpose of this study was to investigate the underlying diseases. The thyroid is a candidate for thyroidectomy in people with PTC. Material and Methods: This descriptive cross-sectional study was performed with the participation of ۹۹ patients undergoing thyroidectomy from ۲۰۱۰ to ۲۰۲۰ at Tabriz University of Medical Sciences. Patients' pathology results were evaluated, and comorbidities were extracted for each patient. Results: Follicular variant includes ۵ cases and classic variant. All ۵ follicular variants were women. In the studied samples, ۳۵ cases were associated with lymphatic involvement and ۶۴ cases were without lymphatic involvement. In the studied samples, ۵۰ cases had Hashimoto's underlying disease, and ۴۹ cases had multinodular goiter underlying disease.Conclusion: Due to the high prevalence of Hashimoto's underlying disease in patients with papillary thyroid carcinoma, which has been proven in this study and other studies, as well as the higher prevalence of lymphatic involvement in the cases associated with these two diseases in this study.

Hashimoto's, thyroid papillary carcinoma, thyroidectomy