Due to the popularity of ultrasonography, the diagnosis of cysts in the prenatal fetal abdomen is increasing, due to the fact that cysts are the most sensitive indicator for ultrasound. In ultrasound images, it is possible to see a description of a dark area of fluid visible in the fetal abdomen, the size of the area, the location of the cyst in a part of the abdomen, etc. What are the common cysts? 1, usually the most common is ovarian cyst (provided it is a female fetus), whose ultrasound features are a single isolated dark area of fluid, which can be huge, with clear borders and thin walls, located on one side of the abdomen, but can move up and down, so it can appear in the upper or lower abdomen, mostly in the lower abdomen. 2. Intestinal cysts, whose ultrasound features are single cysts, rarely huge, usually mostly in the range of 3-5 cm, often with unclear borders on one side and slightly thick walls, can be located in any part of the abdomen, noting that they are not associated with the abdominal wall, but with the digestive tract, and their professional academic name is congenital duplication malformation of the digestive tract, so they can appear in the upper and lower abdomen. 3. Mesenteric lymphatic cysts, which are characterized ultrasonographically by multiple cysts of variable size with indistinct borders and thin walls, are retroperitoneal because they come from the mesentery, so they are mostly in the mid-abdomen. There are also such as cystic teratomas, renal cysts, ureteral cysts, giant ureteropathy, and parasitic fetuses. What do I need to do if I find a fetal abdominal cyst? 1. The current medical opinion is that the content of all cystic structures is benign, so in principle, there is no need to consider induction of labor. 2.Current medical data show that the occurrence of fetal cystic structures has no correlation with genetics and chromosomes. 3, The current fetal outcome is considered to have some correlation with excessive amniotic fluid, so excessive amniotic fluid, which can occur in some cases of cysts, does not affect the prognosis. In conclusion, fetal abdominal cysts are mostly a benign gestational process that does not require much intervention during pregnancy and perinatal process, with regular ultrasound review, supplemented by MR examination if necessary. What is the choice of delivery method at birth? In the case of uni-factor, in principle, natural delivery is preferred, and cesarean delivery should be considered only if the cyst has comorbidities or is huge. Choice of treatment after birth? Postnatal cysts require postnatal re-evaluation, usually opting for ultrasound and MR or CT, and depending on the findings, deciding whether there is a clear indication for surgery. For symptomatic cysts early after birth, surgery can be performed in the neonatal period. For asymptomatic cysts, surgery may be chosen in the neonatal period or in infancy or childhood, but in principle, resolution within two years of age is preferable. Our principle is to routinely remove them surgically in the neonatal period. What is the choice of surgical treatment? In principle, minimally invasive techniques are chosen for surgical treatment, supplemented by conventional dissection. However, in the neonatal period, because surgical instruments do not yet have too little room to operate, surgery in the neonatal period is based on small incisions for dissection. What is the prognosis for treatment? The prognosis for fetal abdominal cysts is good, and no deaths or serious complications have been observed.