Many people ask, “If the child has a widened lateral ventricle, does that mean there is something wrong?” Of course not. You should be careful only if the widening is 15 mm or more. As I mentioned earlier, there are mild, moderate and severe widening of the lateral ventricles, so the recovery of the child is different. Now we tend to call a 10 to 12 mm widening of the lateral ventricles a critical widening. It is now found that more than 80% of fetuses with mild lateral ventricular widening are normal after birth. However, there are some fetuses with mild widening who are found to have a gradual increase in the width of the lateral ventricles at regular checkups, for example, 11-12 mm at this checkup, and then it has developed to 13-14 mm at 2-3 weeks recheck, and then it becomes 14-15 mm at recheck. This condition may indicate the presence of neurological and intellectual impairment after birth. Of course, whether it is a gradual widening to 15 mm or more, or whether it is 15 mm or more at the first examination, the final recovery is poorer. We know that although the brain is soft, the skull on the outside of it limits its volume. If there is more water in the brain, there is correspondingly less space available for the brain to develop. So if the lateral ventricle reaches the standard of 15 mm or more of hydrocephalus, it flattens the brain more, which in turn has an impact on the child’s neurodevelopment. The cause of lateral ventricular widening determines whether the child can stay or not Many people also ask, “Why does my child have a widened lateral ventricle? What causes it?” Lateral ventricular widening is not a simple disease, it is only a symptom, and there may be many complex causes behind it, which ultimately lead to river congestion. A few are listed below: 1. There are congenital abnormalities in the development of brain structures, which are congenital blockages. 2. There are many causes that can cause spontaneous intracranial hemorrhage in the fetus in utero, and the clots that form can clog the river. Of course if the lateral ventricle is widened in this way, the effect will be relatively small. There may be a way to save the child after birth. 3. Viral infection may also cause widening of the lateral ventricles. The virus invades into the brain cells and causes abnormal brain development. In addition, a few cases are due to chromosomal problems, such as Down syndrome, which is also known as congenital mental retardation, and such children also tend to show the performance of ventricular widening. When we find a widened lateral ventricle, the first task is to confirm whether it is really wide; the second is to confirm what causes the widening. If all of these factors are checked and no clear causative factor is identified, then we call this type of lateral ventricular widening isolated lateral ventricular widening, and this condition can continue to be observed. If the widening of the lateral ventricle is found to be combined with other abnormalities, it is important to consider whether the child is suitable or not.