What is the cause of the fetal cisterna choroidea being about 10mm wide?

Patient's question:

Biparietal diameter (BPD); 83 mm, Occipitofrontal diameter (OFD); 104 mm, Femur length; 62 mm, Abdominal circumference; 286 mm, Maturity; Grade II, Fetal heart rate; 163 beats/min, Amniotic fluid index (AFI); 122 mm, Umbilical artery flow; S/D; 2.36, PI; 0.90, RI; 0.58.
The fetal head is located above the symphysis pubis, the fetal skull is intact, and the spine is on the left side. The placenta is located on the anterior wall, with a maximum thickness of approximately 31 mm. The amniotic fluid is moderate.
In the third trimester examination, the fetal face, limbs, and other structures are poorly visualized.
The posterior horn of the lateral ventricle on the left side of the fetus is approximately 6 mm wide.
The width of the fetal septum pellucidum is approximately 10 mm.

Doctor's answer:

Consider an abortion. It is best to consider a conventional surgical abortion. Medical abortion is prone to incomplete abortion, which can cause severe bleeding. Painless abortion is easily likely to cause uterine perforation. It is best to undergo a hysteroscopic-guided curettage under the guidance of a doctor. There are no residual tissues after the surgery, so it will not cause severe bleeding. It is the safest method for abortion. Generally, doctors will advise women with signs of genetic risks to have bed rest and avoid sexual activity. In addition, patients should also create an environment conducive to emotional stability and stress relief. Wishing the patient a healthy delivery.

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