For every woman who has the requirement to have children after pregnancy, it is recommended to go to the obstetrics department of the hospital to build a card for maternity checkups. During the maternity checkups, 4D ultrasound examination is a mandatory item because it can exclude fetal parenchymal organ malformations. As long as the ultrasound report indicates that the fetus is intrauterine single live fetus and there is no other additional explanation, it indicates that there is no malformation of the fetus’ parenchymal organs. If the ultrasound report concludes that the fetus is a single live intrauterine fetus and there are other additional indications, such as a widened fetal lateral ventricle or an abnormal abdominal mass, it means that the fetus may have an abnormality, and the size, location and nature of the mass should be accurately described in the ultrasound. The exact size of the fetal lateral ventricle widening can also be seen.