The thymomas were located at the anterior mediastinum or extension to middle mediastinum from anterior mediastinum. The mass protruded a side of the medinstinum(14/25,56%)and pushed neighboring vessel structures(16/25,64%).

• 胸腺瘤多局限于前纵隔或延伸至中纵隔,肿块多偏向纵隔一侧(14/25,56%25),邻近血管结构多受推移(16/25,64%25);