There are two major study groups according to the treatment status of the patient's population. The first group included patients who had pathology proofed previous cancer and with clinically cervical lymphadenopathies after treatment. The second group included patients with cervical lymphaenopathies but without previous diagnosis of malignancy and treatment. The disease groups were further classified as metastatic nodes from nonthyroid primary (META), lymphoma (LYM) and metastatic nodes from papillary carcinoma of the thyroid (PAP).