Prevalence of thyroid nodule and its association with β-cell autoantibodies in adult patients with type 1 diabetes mellitus without thyroid dysfunction

Objective Although many studies have shown the relationship between type 1 diabetes mellitus (T1DM) and autoimmune thyroid diseases, few studies have conducted a morphological evaluation of the thyroid gland in T1DM without thyroid disease. This study aimed to compare thyroid ultrasonography findings of the healthy control group with the T1DM group without thyroid disease and examine the relationship between β-cell autoantibodies and the presence of thyroid nodules. Methods This cross-sectional study included 119 patients with T1DM and 105 healthy controls. Thyroid function tests, thyroid volume, and presence of thyroid nodules were compared between the two groups. Patients with T1DM were divided into two groups according to the presence of thyroid nodules, and risk factors that may affect the development of thyroid nodules were tried to be determined. Results No significant difference was found between the control group and the T1DM group in terms of thyroid function tests, thyroid volume, and presence of thyroid nodules. In the T1DM group, the number of female patients and the islet cell antibody (ICA) positivity rate were higher in the presence of thyroid nodules. As a result of regression analysis, ICA positivity in the T1DM group increased threefold the risk of having thyroid nodules. Conclusion A relationship was observed between ICA positivity and thyroid nodules in T1DM. Thus, cases with ICA positivity may have a higher probability of nodules in the thyroid gland, and neck examinations should be performed more frequently.