The width of the posterior horn of the lateral ventricle is an important indicator to predict the development of fetal neurological function, mainly referring to the width of the posterior horn of the lateral ventricle. If the width of the posterior horn of the lateral ventricle exceeds one centimeter, it may be caused by the presence of fetal growth abnormalities, mainly considered to be related to viral microbial infections or the presence of chromosomal abnormalities. If the examination suggests that the widening of the posterior horn of the lateral ventricle is not necessarily an absolute problem, it may be related to fetal growth and developmental restriction, and may change later with the change of nutritional status or ischemia and hypoxia, it is recommended to review the ultrasound regularly to observe whether there is any change in the width. If necessary, it is recommended that the level of nutrition needs to be ensured and oxygen can be administered under the guidance of a physician to improve intrauterine ischemia and hypoxia. If adults find that the posterior inferior widening of the lateral ventricle is considered to be due to growth and development.