If the mediastinal lymph nodes are relatively small, they can be removed together with the tumor on the lung and may be cured. If the mediastinal lymph nodes are small, they can be removed together with the lung tumor and may be cured. After surgery, depending on the pathological stage, radiotherapy and chemotherapy may be required in some cases. If the mediastinal lymph nodes are large at the time of detection and it is difficult to remove them, simultaneous radiotherapy can be given first, and after the tumor shrinks, some of them can be removed surgically and have a chance to be cured. If the mediastinal lymph nodes have already invaded important organs such as local esophagus and thoracic aorta at the time of discovery, surgical resection is generally not possible and treatment methods such as radiotherapy and chemotherapy can only be formulated according to the specific pathological type.