Peripheral lung. According to Baijiahao, the surgical site of cryoablation of lung cancer is the periphery of the lung, which enters the periphery of the lung through the bronchus without any damage or hindrance, and is accurately placed in the center of the focus of early cancer. Cryoablation uses a hard needle through the chest wall, which will damage normal lung tissue, pleura, interlobar fissure, trachea, blood vessels and so on. And it is easy to cause complications such as pneumothorax, bleeding and needle implantation. In addition, puncture through the chest wall may be blocked by blood vessels, scapula, ribs and other structures, and the lesion cannot be reached.