RT Journal Article T1 Clinical and Ultrasound Thyroid Nodule Characteristics and Their Association with Cytological and Histopathological Outcomes: A Retrospective Multicenter Study in High-Resolution Thyroid Nodule Clinics. A1 Molina-Vega, María A1 Rodríguez-Pérez, Carlos Antonio A1 Álvarez-Mancha, Ana Isabel A1 Baena-Nieto, Gloria A1 Riestra, María A1 Alcázar, Victoria A1 Romero-Lluch, Ana Reyes A1 Galofré, Juan C A1 Fernández-García, José C K1 fine needle aspiration K1 thyroid nodules K1 ultrasound AB Thyroid nodules are a common finding. A high-resolution thyroid nodule clinic (HR-TNC) condenses all tests required for the evaluation of thyroid nodules into a single appointment. We aimed to evaluate the clinical outcomes at HR-TNCs. A retrospective cross-sectional multicenter study including data from four HR-TNCs in Spain. We evaluated fine-needle aspiration (FNA) indications and the association between clinical and ultrasound characteristics with cytological and histopathological outcomes. A total of 2809 thyroid nodules were included; FNA was performed in 82.1%. Thyroid nodules that underwent FNA were more likely larger, isoechoic, with microcalcifications, and in younger subjects. The rate of nondiagnostic FNA was 4.3%. A solid component, irregular margins or microcalcifications, significantly increased the odds of Bethesda IV-V-VI (vs. Bethesda II). Irregular margins and a solid component were independently associated with increased odds of malignancy. Thyroid nodules In this large multicenter study, we found that the presence of a solid component and irregular margins are factors independently related to malignancy in thyroid nodules. Since nodule size ≥40 mm was associated with the lowest odds of malignancy, this cut-off should not be a factor leading to indicate thyroid surgery. HR-TNCs were associated with a low rate of nondiagnostic FNA. SN 2077-0383 YR 2019 FD 2019-12-09 LK https://hdl.handle.net/10668/27789 UL https://hdl.handle.net/10668/27789 LA en DS RISalud RD Apr 6, 2025