TG and neoplasm: The median age of the patients, tumor size, volume of the thyroid gland, median and mean concentration of preoperative Tg were 52 years (range, 9 to 82), 1.5 cm (range, 0.4 to 2), 20 ml (range, 5 to 162), 50 ng/ml (range, 1 to 3,424), and 125 (range 1 to 3,424) ng/ml, respectively.