Fetal bilateral choroid plexus cyst means that a choroid plexus cyst is present on both the right and left sides of the fetal cranium. Fetal bilateral choroid plexus cyst is a common term used in ultrasound examination, which means that there is a cystic mass in the choroid plexus on both sides of the fetal cranium. Usually, choroid plexus cysts appearing in the 10th to 16th week of pregnancy are the normal physiological changes in the development of the fetal brain, and with the growth of pregnancy, they can disappear by themselves after the 28th week of pregnancy, and there is no need to have special treatment in this case. If the choroid plexus cysts are abnormally large bilaterally and have not disappeared after 28 weeks of pregnancy, or if the fetus is combined with other structural abnormalities, further examination should be performed to clarify whether there are any malformations or other problems in the fetus. When the fetus shows abnormal manifestations, an individualized treatment plan needs to be formulated under the guidance of a professional physician to avoid adverse pregnancy outcomes.