 - Participant must have histologically confirmed lung cancer and be deemed an appropriate surgical candidate for thoracoscopic lung resection and will have consent for a sentinel lymph node mapping by their oncologic surgeon. These patients will have invasive non-small cell lung cancers for which thoracoscopic mediastinal lymph node dissection at the time of thoracoscopic lung resection is standard of care. The extent of lung resections in potential trial patients could span from sublobar resection i.e. wedge resection to pneumonectomy, though it is anticipated that most patients will be undergoing the most common anatomic operation for lung cancer which is lobectomy. 