Fetal choroid plexus cysts 4 * 3 may be physiological factors, there are also pathological changes, physiological fetal choroid plexus cysts, is the fetal development process of lateral ventricles of the brain cyst-like structural changes, with the increase in months of pregnancy, eliminated by itself; pathologic fetal choroid plexus cysts, for the development of the fetal brain structure deformities, resulting in increased brain pressure, mental retardation. 1. Physiological changes: if ultrasound examination found choroid plexus cysts within the fetal ventricle before 24 weeks of pregnancy, if less than 1 cm, no treatment is needed, generally belong to physiological changes, a kind of change and process in the process of fetal development, which will be eliminated by itself, and ultrasound review can be conducted after 2~4 weeks. 2. Pathological changes: If the cyst persists after 24-28 weeks of pregnancy, the ultrasound review, considering the existence of fetal brain structural development abnormalities, which will lead to increased intracranial pressure in the fetus, affecting the intelligence of the fetus, and chromosomal anomalies have a certain relationship with the consideration of the chances of suffering from trisomy 18-trimester syndrome, it is recommended that further amniocentesis, if the diagnosis of the termination of pregnancy in a timely manner. Fetal choroid plexus cysts, in addition to the exclusion of physiological factors, need to regularly visit the hospital for examination and diagnosis.