Malignant thymoma is usually reviewed for the first time within 1 month after surgery, the second time in 3-6 months, and the third time within one year after surgery. Malignant thymoma generally refers to thymic carcinoma, which is a malignant tumor and is usually caused by thymic epithelial cells. The pathologic type is mainly squamous carcinoma and adenocarcinoma is relatively rare. The degree of malignancy of thymic carcinoma is relatively serious, and it can infiltrate the surrounding fat, lungs, pleura, pericardium and large blood vessels in the early stage. Some patients with thymic adenocarcinoma have invasion of mediastinal structures, which may manifest as cough, chest pain, dyspnea, phrenic nerve paralysis, and some patients may have symptoms such as emaciation and night sweating. It is recommended that patients with malignant thymoma should have the first review within 1 month after surgery, the second review is scheduled in 3-6 months, and the third review in one year after surgery. Patients should follow the doctor’s instructions for review, diet and activity and report any abnormalities to their healthcare provider immediately.