The doctor replied. Puncture under CT positioning, the main steps are as follows. First, a chest CT scan is performed to measure the size, density and shortest straight-line distance to the skin of the mass, mark the number of beds, and mark the puncture point on the skin. Then disinfect the skin at the puncture site, lay a small hole drape, and anesthetize the puncture point. Use an 18G disposable biopsy needle or semi-automatic biopsy gun to puncture the lung mass through the skin, subcutaneous tissue, intercostal muscles and pleura. Multiple scans are required during this process. Adjust the direction and depth of the puncture needle until the tip of the puncture needle enters the edge of the mass. Instruct the patient to hold his breath, activate the puncture needle, quickly withdraw the puncture needle, and send the tissue out for medical examination.