A cyst in the fetal brain that has not absorbed after one month is sufficient for continued observation if the cyst is relatively small. If the cyst is large or continues to increase in size, further diagnosis based on amniocentesis is needed to determine whether to continue the pregnancy. Most of the cysts on the head of the fetus are widened lateral ventricles. Generally, 4D ultrasound will be performed around 24 weeks of a woman’s pregnancy to conduct a gross examination. If the cyst on the fetal brain, is less than one centimeter or less, and there is no obvious change after one month, generally do not need special treatment, continuous observation can be. However, if the cyst in the fetal brain is more than one centimeter, or even continues to increase in size after one month, further diagnostic analysis such as cranial MRI and amniocentesis is needed to determine whether the patient can continue the pregnancy. To summarize, it is recommended that patients go to the hospital for examination to understand the specifics of the condition, and then follow the guidance of professional doctors to actively treat the condition.