Fetal lateral ventricular widening suggests a possible brain development problem related to excessive cerebrospinal fluid production or impaired absorption, which is not a frequent occurrence. As medical technology continues to advance, the detection of fetal lateral ventricular widening is becoming more accurate, resulting in a higher detection rate in cases of abnormalities. Under normal circumstances, the width of the fetal lateral ventricle body is ≤10mm, averaging around 7mm, and remains basically the same size from 14 to 40 weeks of pregnancy, while more than 10mm is considered a widened lateral ventricle. Lateral ventricular widening is mainly due to excessive fetal cerebrospinal fluid, central nervous system abnormalities, viral infections, chromosomal abnormalities and other factors, which can also lead to widening of the lateral ventricles. If the fetal lateral ventricular widening is mild, it will not affect the development and function of the brain, and no special treatment can be given if there are no comorbidities. However, if the widening of the lateral ventricles is more severe, combined with neurological abnormalities, chromosomal abnormalities, or organ developmental malformations, timely intervention may be required, and if necessary, the pregnancy may need to be terminated.