A 4D ultrasound can determine the development of fetal organs, and when it suggests that the anterior horn of the right ventricle is hyperechoic, it indicates that hydrocephalus may be present. Normally, there is little fluid in the ventricles, which will show up as normal echoes on ultrasound examination. If there is a high echo, it means that it contains too much cerebrospinal fluid, which is also known as hydrocephalus, and it is due to the excessive secretion of cerebrospinal fluid or obstruction of its drainage, etc. It is an abnormality of cranial development. It is an abnormality of cranial development. In this case, a clear examination is needed to determine whether there is a chromosomal abnormality. When the four-dimensional ultrasound shows that the right anterior horn of the ventricle is high echo, it is recommended to go to the hospital in time, under the guidance of the doctor to carry out standardized examination and treatment, to clarify the specific causes, and if the abnormality is more serious, it is necessary to consider terminating the pregnancy if necessary.