There is no clear data on the probability of lung cancer, which needs to be determined according to the condition of the mass and other examinations. Lung mass shadow is a kind of result of lung CT, chest X-ray and other examinations, which may be caused by inflammation, tuberculosis and malignant tumors. There is no way to diagnose lung cancer by lung mass shadow alone, and there is no clear probability of lung cancer, which needs to be analyzed according to the pattern of the mass and biopsy of the pathological tissues. The larger the size of the lung mass and the unclear edge of the mass, the higher the chance of lung cancer; if the area is small and the edge of the mass is clear, it is most likely to be caused by inflammation, tuberculosis, and so on.