Lateral ventricle width of 1cm has remained unchanged on three retests and may widen. The upper limit of the diameter of the normal lateral ventricle is 10mm, and the width also needs to be further analyzed according to the examination results. If it is a fetus line ultrasound examination found that the lateral ventricle widening 1cm, review three times did not change, no special reasons other than, such as intrauterine infection, chromosomal abnormalities and other factors, in the 14 to 40 weeks of gestation is basically stable, the general possibility of change is small. However, if a woman has no significant change in the width of the lateral ventricles during pregnancy when the fetus is reviewed three times, but a viral infection or other condition occurs at a later stage, the lateral ventricles may also widen again. In addition, widening of the lateral ventricles can also be seen in adults, such as intracranial infections, trauma and other factors, and if they are not treated in a timely manner, and serious infections and other conditions occur later in life, the possibility that they will widen again cannot be completely ruled out. Regarding the question of whether the lateral ventricle widening of 1cm, which has remained unchanged for three times, will change in the later stages, there is a great deal of individual variability, so it is recommended to consult a specialized doctor.