Patient: Description of the condition (onset, main symptoms, hospital visited, etc.): July 6 (33 weeks +5) Ultrasound Fetal head position BPD8.8cm,FL6.8cm,HC32.5cm,AC30.9cm,HC/AC=1.05,Fetal heart rhythm 142 beats/min Regular Umbilical artery A/B=2.66 Maximum depth of amniotic fluid dark area 5.2cm,AFI=16.6cm The fetal cerebellar medullary pool is 1.4cm wide and the internal diameter of the posterior horn of the lateral ventricles is 0.7cm on both sides. Ultrasound on July 18 showed 0.8 cm of one lateral ventricle), no significant widening of the sulcus fissure, the presence of cerebellar earthworms, and no significant displacement of midline structures. Imaging impression: consistent with a slightly widened MR presentation of the fetal cerebellar medullary pool. The ultrasound results on August 6 are as follows: fetal biparietal diameter is 9.7cm, femoral length is 7.3cm; fetal heartbeat is good, maximum depth of amniotic fluid is 7.1cm. placenta is located on the right wall, maturity level 2. The fetal nuchal transverse pressure mark was seen. Color Doppler: umbilical blood flow is seen around the fetal neck, umbilical artery blood flow S/D