Radical Resection With Contralateral Lymph Node Dissection for Clinical N3 NSCLC

The patient will be positioned in a contralateral decubitus position based on the location of the primary tumor, with the axillary region on the side of the primary tumor exposed. For example, if the patient is diagnosed with left-sided primary lung cancer with right-sided lymph node metastasis, investigators perform left axillary incision to resect the tumor. And then investigators change the patient's position to perform right axillary incision to resect the lymph nodes. Thoracoscopy surgery will be used to access and resect the primary lesion and lymph node metastasis.