The severity of pulmonary atelectasis depends on the nature of the atelectasis. If it is congenital pulmonary dysplasia, from childhood to adulthood, if you do chest imaging, can be found in the dysplasia of the lung expansion insufficiency, may not have clinical symptoms, or may be combined with the infection of coughing, coughing yellow sputum, sputum in the blood, the general recommendation is that the patient’s surgical treatment. If the lung expansion is caused by pleural effusion compressing the lung tissue, the nature of the pleural effusion needs to be further clarified, such as whether it is a common infection, tuberculosis infection or cancerous infection. If it is a common infection, the pleural fluid will be absorbed after anti-infective treatment is given and the lung expansion will disappear. If it is tuberculous pleurisy, after standardized anti-tuberculosis treatment, the pleural fluid will be absorbed and dissipated, and the lung atelectasis and pulmonary distension will be completely recovered. In case of cancer-induced obstructive pneumonia, atelectasis, and pulmonary distension insufficiency, comprehensive treatments such as surgery, radiotherapy, and chemotherapy need to be given to target the tumor lesion. Pulmonary distension insufficiency caused by this condition is not easy to disappear, and it belongs to the most serious kind of state with a poor prognosis.