Thymic tumors have the potential to recur, and once diagnosed, they should be treated with surgery as soon as possible. Thymic tumor is the most common primary tumor in the anterior mediastinum. Some patients do not have obvious symptoms and only find mediastinal mass during physical examination; most of the patients have cough, shortness of breath, chest tightness and other symptoms due to the enlargement of the mass which compresses or invades adjacent tissues and structures. Due to the possibility of recurrence, all thymic tumors are considered malignant, and once the diagnosis is clear, surgical treatment should be performed as early as possible. Thymoma resection via median sternotomy is the standard surgical method for thymic tumors, and the thymus and surrounding tissues should be removed as much as possible during the surgery. If the tumor invades the surrounding tissues and organs, such as the pleura and pericardium, the diseased portion of the tumor needs to be resected as well in order to prevent recurrence.