Fetal isolated lung with the popularity of ultrasound has gradually unraveled the mystery, more and more isolated lung during the prenatal fetal period is found, but the ensuing problems have entered an awkward situation in our medical care, when you face an obstetrician, the vast majority of doctors will let you induce labor because they believe it is an abnormality of the fetus; and when you ask an ultrasound doctor, most doctors will tell you that The impact seen by ultrasound is for clinical reference only, and your problem to find an obstetrician or other clinician to consult; and when you consult a clinical pediatrician or pediatric surgeon, you will usually be told that you can find him when your child is born, what is the reason for such a phenomenon? The answer is that there are no clinical fetal doctors in our country yet, which is a gap in medical care at the moment. Going back to fetal isolated lung, how do we address the reality of the problem after it is discovered? Step 1: Definitive diagnosis Ultrasound is needed for more than two standard obstetrical exams to see a hyperechoic mass in the fetal lung and to describe its volume, i.e., length X width X height. After deriving the volume, its CVR value can be calculated (see fetal cystic adenoma of the lung) to know its CVR risk level, and Doppler is needed to check that the source of blood flow to the mass is from the aorta so that the diagnosis of isolated lung can be confirmed. Step 2: Evaluation of the fetus This is to determine the risk of the fetus in utero. The degree of lung development can be determined based on a CVR greater than or less than 1.6. The former has a high risk level and requires close prenatal attention or intervention, especially if combined with fetal pleural effusion or edema, while the latter is generally safer and can be evaluated after birth. In addition, fetal MR examination can be done if available to further understand the isolated lung condition of the fetus. The incidence of the former is about 5-10%, while the latter accounts for the majority. A part of them has a tendency to gradually disappear after 32 weeks prenatally, about 1/4 or 1/5, but it should be emphasized that in the disappearing cases, about 50% or more of the lesions are still present when examined after birth, so it is emphasized that CT examination of the newborn’s chest should be routinely performed after birth, regardless of whether it disappears or not, which means postnatal re-evaluation. Some parents may worry that CT is very harmful to people and delay the examination, but in fact, they are too worried because normal people can tolerate the radiation of CT, and there is no need to worry about it because it is not a frequent examination. Step 3: Fetal and postnatal treatment Prenatal fetal treatment, mainly risky or comorbidities, open fetal surgery or penetration of the fetus, but currently not carried out in China, foreign reports are also less, which is mainly most of the isolated lung is relatively benign process. In some severe cases, intrapartum fetal surgery is an option, i.e., fetal isolated lung surgery is performed at the time of cesarean section, before the fetus is born but before the umbilical cord is broken and leaves the mother. There are two opinions on the treatment of asymptomatic isolated lung after birth, one is to do it early, after the diagnosis in the neonatal period, surgery, I am an advocate of this view, the reason is that we have been engaged in neonatal surgery for a long time, for the treatment of isolated lung has not yet failed to record, neonatal surgery has been completed more than twenty cases, and recently also carried out minimally invasive surgery, the results are satisfactory; the other opinion is to wait until the big Some say that 2-6 months is more appropriate, some say that 1-3 years is the best time for pediatric lung development, so this is the best time, and some suggest not to do the surgery and wait until later when they are older. In conclusion, the general prognosis for fetal isolated lung is better and there is no need to induce labor or terminate the pregnancy, but prenatal fetal evaluation needs to be performed by a professional and in case of uncertainty, expecting treatment is the best option.