 There are several components of NSCLC staging which then influence physicians' treatment strategies.The lung tumor itself is typically assessed both radiographically for overall size as well as by a pathologist under the microscope to identify specific genetic markers or to see if there has been invasion into important structures within the chest (e.g., bronchus or pleural cavity).Next, the patient's nearby lymph nodes within the chest cavity known as the mediastinum will be checked for disease involvement.