Thin-walled hypodense areas are seen in the upper lobe of the left lung, which may be pneumothorax, unilateral (left) emphysema, pulmonary cysts and other diseases.
1. Pneumothorax: refers to pneumothorax secondary to various diseases of the lungs, which is caused by the formation of pulmonary pustules and rupture or direct injury to the pleura on the basis of various lung lesions. It manifests as a very low density gas shadow in the pleural cavity, accompanied by different degrees of atrophic changes of lung tissue.
2. Unilateral (left) emphysema: mainly caused by smoking, infection, dust, congenital lung tissue underdevelopment, abnormal development of pulmonary circulation, mainly manifested as chest tightness, dyspnea, cough, sputum and so on. If it occurs in the left side, the imaging examination can show that the left lung can be seen as a thin-walled, low-density shadow.
3. Pulmonary cysts: single or multiple cystic lesions containing gas, air fluid and liquid in the lungs, mainly caused by congenital developmental abnormalities, lung infections, medical pyothorax and traumatic lung contusion. When the lung cyst accumulates more gas, it can cause the lung tissue to be compressed and atrophied, and a large amount of accumulated gas presents a uniform low-density fuzzy shadow on the affected side.
It is recommended that patients go to the hospital in time to find out the cause of the disease and have regular treatment as soon as possible.