A choroid plexus cyst on both sides at 17 weeks’ gestation can be observed for the time being and may resorb on its own thereafter if it is not associated with other malformations. If malformations are suspected, amniocentesis is needed to confirm the diagnosis. 1. Normal phenomenon: choroid plexus cysts are usually found between 14 and 24 weeks of pregnancy, and basically disappear after the fetus reaches 26 weeks of development. There is no need to do any intervention or other examination, normal labor and delivery examination can be done. 2. Chromosomal abnormality: bilateral choroid plexus cysts that do not disappear after 28 weeks of pregnancy, or even intermittent enlargement of the choroid plexus cysts, may be fetal chromosomal developmental abnormalities or a combination of other malformations, the need for amniocentesis, to determine the cause of the disease. Choroid plexus cysts on both sides of the 17th week of pregnancy should be rechecked in regular hospitals, and the next step of treatment should be carried out under the guidance of professional doctors.