What is a mediastinal mass: mediastinal organs and tissues within the wide range, with the heart, great vessels, trachea, main bronchus, esophagus, also rich in nerves, lymph and connective tissue. Mediastinum is located in the middle of the chest, between the pleural cavity on both sides, both sides of the outer edge of the mediastinal pleura, the former for the sternum and attached muscles, the spine and the sides of the spine after the next groove, the upper bound for the formation of the first thoracic vertebra and sternal manubrium thorax population, the lower bound for the leap muscle.
What is a mediastinal tumor: people accustomed to the mediastinum is divided into four areas, namely, the mediastinum (anterior mediastinum, posterior mediastinum), anterior mediastinum, middle mediastinum and posterior mediastinum. During the embryonic development due to abnormal or acquired cyst or tumor formation, to become tumor, it has substantive and cystic, benign and malignant, congenital and acquired distinction. Thymic tumor, neurogenic tumor, teratoma, cysts and various types of thyroid cancer is the most common mediastinal tumors, their incidence rate of 80% -90 mediastinal tumor%, of which the first three account for two-thirds of mediastinal tumors II.