Ultrasound ultrasound report often indicates that the width of the lateral ventricle is about XXmm, so what are the diagnostic criteria for the widening of the lateral ventricle? The standard method of prenatal ultrasonography to determine whether the ventricle is widened and the degree of lesion is: measuring the width of the body of the lateral ventricle, normal <10mm, average 7mm, the width of the lateral ventricle <10mm is called widening of the lateral ventricle; the inner diameter <10mm, but <15mm is called mild widening, <15mm is severe widening, also can be called hydrocephalus. Clinical management suggestions: 1. When the internal diameter is 10mm, it is generally recommended to review it regularly. 2. If the lateral ventricle is mildly dilated, the following is recommended: (1) Perform karyotype analysis to exclude chromosomal abnormalities. (2) Lateral ventricular widening is also associated with intrauterine fetal infection, and screening for TORCH virus is advisable. (3) MRI (magnetic resonance imaging) should be performed to help exclude central nervous system lesions. 3. Severe widening of the lateral ventricles, i.e. hydrocephalus, is generally not recommended for further pregnancy.