What is the fetal form of B-ultrasound hydrocephalus?
summary
Generally speaking, fetal hydrocephalus is congenital. If there is such a phenomenon, it can be detected by B-ultrasound from 12 to 18 weeks of pregnancy, and it can be accurately determined at the latest 20 weeks of pregnancy. What is the fetal form of B-ultrasound hydrocephalus? Let's talk about it
What is the fetal form of B-ultrasound hydrocephalus?
When hydrocephalus occurs, the ventricles expand first, and the fetal head circumference increases only after the amount of hydrocephalus reaches a certain degree. Mild hydrocephalus does not affect the head circumference, so the biparietal diameter can not be used as the basis for diagnosis. The biparietal diameter of fetus with full-term hydrocephalus can reach 12 cm.
When the prominent choroid plexus in the lateral ventricle is relatively smaller, the abnormal image of early hydrocephalus should be considered. Therefore, if the choroid plexus can be seen filling the lateral ventricle in the transverse section of fetal head, the possibility of hydrocephalus can be ruled out. The relationship between the size of the choroid plexus and the lateral ventricle was maintained until 20-24 gestational weeks, but not after 24 gestational weeks.
It is not difficult to diagnose hydrocephalus by ultrasound in the third trimester of pregnancy. The cephalic circumference was significantly larger than the abdominal circumference. The normal structure of the brain disappeared and replaced by extensive or separated liquid dark areas. The midline structure of the brain became thin, incomplete, or curved, floating in the hydrocephalus. Combined with other malformations and polyhydramnios.
matters needing attention
According to the relevant data, the incidence of hydrocephalus malformation increases with the age of pregnant women. Generally, the incidence rate of 25-29 years old group is the lowest, but the difference is not significant. The incidence rate has an increasing trend after 30 years old. Therefore, it is of certain significance to advocate appropriate age of childbearing for the prevention of hydrocephalus.
