Thin-walled cystic cavity shadows in the lungs are usually common in alveoli, but can also be seen in diseases such as tuberculosis, bronchiectasis, and lung cancer. Lung cystic cavities can be seen for a variety of reasons, such as tuberculosis infection with cavities, bronchiectasis with cystic changes, congenital lung air sacs, cancerous irregular cavities formed in cancer patients, bronchopulmonary cysts, and similar lung cystic cavities caused by thickening of the walls of the alveoli. Thin-walled cystic cavity shadow in the lungs is generally considered to be more likely to be pulmonary alveoli. Pulmonary cysts are thin-walled air-containing cystic cavities in the lungs, often secondary to pneumonia, emphysema and other diseases. When the cystic cavity is infected, the wall of the cystic cavity can be seen as a plane of liquid and gas, and the irregular thickening of the wall of the cystic cavity should be wary of the early symptoms of malignant tumors, and it is recommended that thin-walled cystic cavities in the lungs should be treated symptomatically by a professional doctor to clarify the cause of the disease, so as not to cause delay in the condition.