Introduction: Due to the completely different results of different studies by researchers in different countries and due to the very limited 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. Thyroid is a candidate for thyroidectomy in people with PTC
Material and Methods: This descriptive cross-sectional study was performed with the participation of 99 patients undergoing thyroidectomy during 2010-2020 at Tabriz University of Medical Sciences. Patients' pathology results were evaluated and comorbidities were extracted for each patient.
Results: Follicular variant includes 5 cases and classic variant. All 5 follicular variants were women. In the studied samples, 35 cases were associated with lymphatic involvement and 64 cases. were without lymphatic involvement. In the studied samples, 50 cases had Hashimoto's underlying disease and 49 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 and the cost High care and treatment of patients with PTC One of the effective ways to prevent the occurrence of this carcinoma is timely diagnosis and treatment of patients with Hashimoto's thyroiditis.