Patient's question:
NoDoctor's answer:
If the width of the cisterna magna exceeds 10 mm, it should be alert to ventricular expansion and fluid accumulation, and close follow-up should be conducted to observe its outcome. If the expansion progressively increases during the follow-up, it can be diagnosed as hydrocephalus. In normal fetuses after 20 weeks of gestation, the ratio of the distance from the lateral ventricle to the midline to the distance from the midline to the skull plate (ventricular rate) is less than 1/3. If it is greater than 1/3, it indicates the presence of hydrocephalus. It is recommended to regularly undergo ultrasound examinations at the local general hospital for further confirmation of the diagnosis.