TG and neoplasm: The median age at diagnosis was 37 years (interquartile range (IQR): 29–56 years), the median tumor size was 44 mm (IQR: 30–55 mm), and the median thyroglobulin (Tg) concentration measured before the initial thyroid surgery was 608 ng/mL (IQR: 108–1,565 ng/mL), and 54 (34%) patients had VI ≥ 2.