Thymic malignancies are classified into three types: cortical, medullary, and mixed. 15% of patients have a combination of myasthenia gravis. Because thymus involves human immune function, some diseases may be related to altered autoimmune mechanism. Patients often have different clinical manifestations, the main manifestations are as follows: 1. About 30%-60% of patients usually do not have abnormal sensations and are often found during occasional chest X-ray examinations; 2. Patients with symptoms mainly show local symptoms caused by tumor invasion of adjacent structures, causing symptoms such as cough, chest pain, dyspnea, and recurrent respiratory infections; 3. Some patients may show systemic The most common metastasis of thymoma is intrathoracic metastasis, which leads to the occurrence of pleural fluid and causes dyspnea and chest pain.