1病例孕妇,32岁,孕1产1,平素身体健康,既往无不良因素接触史。孕34w,行产前常规超声检查,超声测值:双顶径8.3cm、头围30.5cm、腹围30.8cm、股骨6.4cm、羊水最大深度7.6cm、羊水指数21.1cm。彩超检查所见:胎头位于子宫内口上,头颅光环完整,颅内结构显示紊乱,于左侧丘脑后方可见一大小约4.7×2.8cm的椭圆形无回声区(图 1 case of pregnant women, 32 years old, pregnant and 1 produce 1, usually healthy, past no history of adverse factors exposure. Pregnancy 34w, prenatal routine ultrasound examination, ultrasound measurements: biparietal diameter 8.3cm, head circumference 30.5cm, abdominal circumference 30.8cm, femur 6.4cm, maximum depth of amniotic fluid 7.6cm, amniotic fluid index 21.1cm. Color Doppler ultrasound examination found: fetal head located in the mouth of the uterus, aura intact, intracranial structure showed disorder in the left thalamus behind a size of about 4.7 × 2.8cm oval anechoic area (Figure