What does it mean when the skull halo is visible?

The fetus needs to undergo many examinations while in the mother's womb. This is a way to promptly detect whether the fetus is sound and healthy. The normal development of the fetus is affected by many factors. The first is whether both parents are healthy, and the second is whether the mother is healthy during the development of the fetus. There is also the impact of the external environment on the fetus. The most common fetal examination is B-ultrasound. So what does it mean when a skull halo is visible on B-ultrasound?

When pregnant women have prenatal check-ups, there is usually an examination item to check whether the fetal skull halo is complete. This is an indicator detected by B-ultrasound to determine whether the fetal head is developing normally. It is performed together with the examination of the fetal internal organs and limbs to show the overall development of the fetus in the mother's womb. A complete fetal skull halo indicates that the child's head is well developed and has no congenital diseases. The process of fetal development in early pregnancy and ultrasound observation Pregnancy is a complex process. After the egg is fertilized, it enters the uterine cavity, and the embryo and its appendages grow and develop rapidly until maturity. There will be different changes in each gestational week. During the embryonic period, the amniotic cavity expands, primitive cardiovascular system appears, and pulsation may occur. Ultrasound can reveal a small gestational sac, which occupies less than 30% of the uterine cavity, or a fetal bud can be seen. The fetal head, brain alveoli, facial organs, respiratory, digestive, nervous and other organs are differentiated, the fetal sac is clearly visible, and the fetal bud and fetal heartbeat are seen. At 21 weeks of gestation, the embryo already has the rudiments of a human being, with all segments differentiated, limbs separated, and various systems further developed. B-ultrasound clearly shows the embryo and fetal heartbeat, and the gestational sac occupies about uterine cavity. The shape of the fetus has been determined, and the head, body and limbs can be distinguished, with the head larger than the trunk. B-ultrasound shows that the gestational sac occupies about the entire uterine cavity, the fetal shape and fetal movement are clearly visible, and the yolk sac can be seen. At 28 weeks, the fetal head is larger than the fetal body, the various parts appear clearer, the skull begins to calcify, and the placenta begins to develop. Ultrasound shows that the gestational sac almost fills the uterine cavity, the fetal outline becomes clearer, and the placenta begins to appear. When the fetus grows to centimeters, all the fetal organs have been formed and the embryonic form of the placenta has been formed. B-ultrasound showed that the gestational sac began to disappear, the crescent-shaped placenta was visible, and the fetus was active in the amniotic fluid. A complete fetal skull halo is a sign that the fetus is basically mature. A complete halo indicates that the fetus is developing healthily in the mother's body and has not developed any embryonic diseases such as hydrocephalus and anencephaly. This is good news, so regular prenatal checkups are still very necessary, allowing parents to understand their child's growth and development in a timely manner and rule out congenital diseases.