Patient's question:
The fetus is 9 months old. The examination shows that the cisterna magna is slightly wider by 1.2. A check-up one and a half months ago showed 1.25, and the previous check-up showed 1.21. This time it is 1.2. Can this condition improve? Thank you.Doctor's answer:
If, except for the slightly widened cisterna magna of the cerebellomedullary cistern, all other indicators are within the normal range, it is recommended to undergo regular follow-up ultrasound examinations to further clarify the diagnosis. If the width of the cisterna magna exceeds 10 mm, it should be a warning sign of ventricular dilatation and accumulation of cerebrospinal fluid. Close follow-up observation of its progression is necessary. If the expansion progressively increases during the follow-up period, it can be diagnosed as hydrocephalus. In normal fetuses after the 20th week of gestation, the ratio of the distance from the lateral ventricle to the midline to the distance from the midline to the cranial bone plate (ventricular ratio) is less than 1/3. If it is greater than 1/3, it suggests the presence of hydrocephalus. It is recommended to undergo regular follow-up ultrasound examinations at the local general hospital to further clarify the diagnosis.