Enhanced CT before lung cancer surgery is generally to define the invasion range of cancer tumor in lungs more accurately, so as to make the surgical resection of lung cancer tumor more effective in terms of eradication, reduce surgical injury, improve the cure rate as well as reduce complications. Chest enhancement CT examination has higher resolution for lung tumor lesions, and it can generally clarify the specific size of lung cancer tumor, the invasion of surrounding tissues such as hilar and mediastinal lymph nodes, and the situation of blood vessels and nerves around the lung cancer tumor, so as to achieve better curative effect of the surgery, and to avoid damaging normal blood vessels and nerves and other tissues in the course of the surgery as much as possible. Before surgery, it is not only necessary to do chest enhancement CT, but also need to do whole abdomen enhancement CT, whole body bone scan, brain MRI and other tests to exclude distant metastasis and to clarify the stage of lung cancer before adopting surgical treatment. It is suggested that patients should go to professional hospitals as early as possible and listen to the advice of professional doctors.