TG and metastatic malignant neoplasm in the lymph nodes: We found that there was correlation between PTC lesion > 1 cm and high BMI, younger age, high TSH and high Tg; between multifocality and high BMI, older age, high TPO-Ab, Tg-Ab; between ETE and high BMI, older age, high FT3, low TPO-Ab, high Tg, high Tg-Ab, low Tg/TSH; between lymph node metastasis and high BMI, younger age, high Tg, high Tg-Ab.