<prompt> The most common mediastinal tumor is-Neurogenic tumorPericardial cystHerniaTeratoma  <response>: Overall most common mediastinal masses are neurogenic tumors 20 followed by thymomas 19, primary cysts 18, lymphomas 13 and germ cell tumors 10.Most of the mediastinal masses are located in the anterior mediastinum followed by the posterior 25 and middle 19. 