孕妇34岁,G1P0。既往体健,孕25周来我院行首次胎儿产前畸形筛查。超声检查:单胎,头位,头颅光环完整,脑中线居中,双顶径6.3cm,腹围21.2cm,股骨长4.3cm。胎盘位于子宫宫底,未成熟。胎心率140次/min,脐动脉一根,脐带于后壁胎盘下缘羊膜处插入。羊水指数13cm。胎儿左肾大小3.3cm×4.8cm,体积增大,内扫见多个大小不 34-year-old pregnant woman, G1P0. Past physical health, 25 weeks pregnant our hospital for the first time fetus prenatal deformity screening. Ultrasound examination: single-child, head position, complete aura, head center line, biparietal diameter 6.3cm, abdominal circumference 21.2cm, femur length 4.3cm. Placenta at the uterine fundus, immature. Fetal heart rate 140 beats / min, a umbilical artery, umbilical cord inserted in the posterior wall of the lower edge of the placenta amniotic membrane. Amniotic fluid index 13cm. Fetal left kidney size 3.3cm × 4.8cm, the volume increases, see multiple sizes within the sweep