Fetal MRI at 33 weeks shows mild dilatation of the left lateral ventricle, if the widening is less than 1.0cm, there is generally no effect; if the widening is greater than 1.5cm, then it is more serious and needs to be dealt with in time. Enlargement of the left lateral ventricle may be physiological factors, this general widening degree is less than 1.0cm, the subsequent may be self-absorbed, generally do not need to treat themselves. It is recommended to check the left lateral ventricle again in two weeks, if it does not continue to grow, it is mostly fine. If the widening is greater than 1.5cm, hydrocephalus may be present and prompt medical attention is recommended. If the ventricles widen further after birth, then surgical treatment is also needed, such as craniotomy with small bone window and ventricular puncture and drainage. If ventricular dilatation occurs during pregnancy, it is important to visit a hospital and be evaluated by a medical professional to see if treatment is needed. If treatment is needed, the appropriate treatment plan should be chosen by a medical professional.