A fetus with hydrocephalus at 8 and a half months of gestation, what would be the biparietal diameter?

Patient's question:

No

Doctor's answer:

Hello, when the anteroposterior diameter of the fetal lateral ventricle exceeds 15mm, it indicates hydrocephalus or significant ventricular enlargement. The current anteroposterior diameter of the fetal lateral ventricle is greater than 3cm, and the third ventricle is also significantly dilated, with the septum pellucidum appearing unclear. At 8.5 months of gestation, the fetal biparietal diameter has reached 9.8cm, and the head circumference has reached 35.4cm. The head circumference has already increased significantly, suggesting that the hydrocephalus in the fetus is very severe.