TG and metastatic malignant neoplasm in the lymph nodes: In our metastatic patients with serum a-Tg values <10 ng/ml (Groups A and B) and lymph-node metastases, post-therapeutic imaging and targeted morphological studies showed few metastatic lesions of smaller size compared to patients with serum a-Tg values ≥ 10 ng/ml (Group C).