Whether bilateral choroid plexus cysts are serious or not depends on the actual situation of the patient. When the cysts are small and can disappear on their own, the symptoms are mild and the prognosis is good; if there is a localized increase in the size of the cysts, the symptoms are more serious and the prognosis is worse. 1. Smaller cysts: Bilateral choroid plexus cysts are cysts that appear in the choroid plexus of the lateral ventricles on both sides of the brain during fetal development, i.e., abnormal development of the fetal brain. Generally, during the process of development, some of the cysts will be absorbed and digested until they disappear, which will have no obvious effect on the fetus and after birth. 2. Enlargement of cysts: If the bilateral choroid plexus cysts are getting bigger and bigger, attention should be paid to them, and 4-dimensional ultrasound examination should be perfected, and surgery or drainage should be carried out if necessary. If the cysts have not disappeared, the development of the fetal brain may be affected, which may later affect the child’s intelligence, and the child may be born with the risk of preterm labor and hypoxia. Patients are advised to have regular labor and delivery checkups to observe the condition of bilateral choroid plexus cysts, and to treat the problem early when it is detected.