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,     Purpose: The aim of this study was to evaluate added value and diagnostic threshold value of thyroglobulin measurement in the fine-needle aspiration washout for detecting cervical lymph node metastasis from papillary thyroid cancer on pre and postoperative patients. Materials and Methods: Total 219 cervical lymph nodes from 180 patients with papillary thyroid cancer were evaluated for fine needle aspiration cytology and thyroglobulin in fine needle aspiration (FNA-Tg), using immunometric chemiluminescent assay. Eighty-six patients were preoperative and remaining 94 patients were on follow up after total thyroidectomy. Final diagnoses were made on pathology of dissected lymph nodes or follow-up examination for at least 12 months. Results: One hundred and twelve metastatic lymph nodes were finally confirmed in 94 patients out of total 180 patients. Sensitivity of FNA-Tg was 99.1, 98.21, 97.20%, respectively with threshold level at 1, 10, serum Tgng/mL, which were higher sensitivity of fine needle aspiration. Combined FNA and FNA-Tg with threshold at 1, 10, 100 ng/mL raised sensitivity and specificity to 100%, respectively. All 6 lymph nodes that were false negative on FNA were correctly diagnosed as metastasis on FNA-Tg with threshold of 1, 10, 100, and serum thyroglobulin. FNA-Tg with threshold level at 100 ng/mL combined FNA showed highest sensitivity (100%) and specificity (97.56%) on preoperative patient groups among the 1, 10, 100, serum Tg threshold value. But, FNA only showed adequately high sensitivity (100%) and specificity (96.96%) on postoperative patient groups. Using receiver operating characteristic curve (ROC) curve analysis, cut off value was 57.69 in total patient, 78.66 in preoperative patient, and 32.81 in postoperative patient. Conclusion: FNA-Tg combined with FNA showed excellent sensitivity and specificity. FNA-Tg showed very high sensitivity and specificity at threshold level 78.66 ng/ mL in preoperative patients, but FNA-Tg had less benefit on the postoperative patient group, having high sensitivity and specificity with FNA alone. Index terms Thyroid Cancer, Papillary Neoplasm Metastasis Lymph Nodes Biopsy, Fine-Needle Thyroglobulin

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Added Value of Thyroglobulin Measurement in the Fine-Needle Aspiration Washout to Diagnose Cervical Metastatic Lymphadenopathy from Papillary Thyroid Cancer