The presence of a mass in the lung, which is only an occupying lesion from imaging, does not necessarily mean that it is cancer. This is because masses in the lungs are also seen in other benign lesions, including infectious factors, such as infections with Staphylococcus aureus, Klebsiella, Pseudomonas aeruginosa, fungi, and parasites, which can also cause masses in the lungs. In addition, there are specific pathogens, such as pulmonary tuberculosis caused by Mycobacterium tuberculosis, which can cause damage to the mucosa of the lung with hyperplasia, fibrosis, calcification and even the formation of cavities, which usually also results in a mass, and benign tumors of the lung, such as teratomas and malignant tumors, which can also present with a mass in the lung on imaging. Therefore, clinically, the masses can be taken for pathogen culture and pathological examination to clarify their nature.