A lung nodule with a burr larger than 8 millimeters is likely to be cancerous. Or if the diameter of a lung nodule with a burr is more than 8 millimeters, the possibility of a cancerous nodule is high. Whether a lung nodule is cancerous or not depends on its size and shape. Relatively speaking, the larger the diameter of lung nodule is, the higher the possibility of cancer, the chance of cancer is around 1% when the diameter of lung nodule is less than 5 millimeters, and when the diameter of lung nodule is more than 8 millimeters, the chance of cancer is significantly higher, and it can reach around 10%. Clinically, the nature of lung nodules cannot be solely based on the size of the lung nodule, but also to determine whether the boundary of the lung nodule is clear and whether it grows faster in a short period of time, accompanied by burrs. Patients who find lung nodules are recommended to go to the thoracic surgery department of a regular hospital for diagnosis. If necessary, puncture biopsy or surgical resection can be performed under the guidance of specialized doctors, and further judgment can be made based on pathological tests.