Isolated lung, or pulmonary isolation, is a condition in which a fetus with pulmonary isolation may be born asymptomatic, or may present with fever, cough, hemoptysis, dyspnea, and cyanosis. Isolated lung is a congenital malformation of lung development, a disease that develops mainly due to the separation of the fetal lung bud tissue from the bronchial tree, resulting in a lack of communication between the lung tissue and the normal airways. After diagnosis of pulmonary isolation on prenatal examination, dynamic observation can be performed, and the lesions in some fetuses are able to shrink or disappear spontaneously. After birth, the fetus with pulmonary isolation may have no obvious symptoms. After lung or respiratory tract infection, there may be fever, cough, purulent sputum, or even hemoptysis, dyspnea, and cyanosis. Prompt treatment is recommended, and usually after surgical treatment, most children can be corrected and the prognosis is better. Pregnant women during pregnancy should pay attention to do a good job of prenatal checkups, actively listen to the advice of professional doctors to do a good job of comprehensive care and health care, pay attention to rest, at the same time should be relaxed, to avoid nervousness, anxiety, any discomfort should be promptly to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.