The presence of shadows in the lungs is commonly associated with the presence of inflammatory and other pathological manifestations of occupying lesions. Inflammatory reactions, such as invasion by viruses, bacteria, mycoplasma, chlamydia, Mycobacterium tuberculosis and other pathogens, cause inflammatory reactions in the mucosa of the lungs, resulting in fibrosis, calcification and inflammatory exudate lesions, and less frequently, malignant occupying lesions in the lungs, such as bronchopulmonary carcinoma and alveolar cell carcinoma. Generally, clinical CT or MRI of both lungs and, if necessary, bronchial fiber endoscopy can be used to take biopsies of suspected occupying lung lesions for pathological examination to clarify the nature of the lung shadows and to provide early treatment.