孕妇23岁,G1P0,孕22+3周,常规产前超声检查:宫内单胎,BPD 51mm;FL 37mm;胎盘附着于子宫后壁,I级,厚度:28 mm,胎盘下缘距宫颈内口约65mm;脐血管数:3根,脐带胎盘插入口位于胎盘实质以外宫颈内口处。超声提示:(1)单活胎,孕22周左右。(2)帆状胎盘,血管前置(图1)。孕37+5周时因阴道少量出血剖宫产证实为帆状胎盘,血管前置(图2)。 Pregnant women 23 years old, G1P0, pregnant 22 + 3 weeks, routine prenatal ultrasound: intrauterine singleton, BPD 51mm; FL 37mm; placenta attached to the posterior wall of the uterus, grade I, thickness: 28mm, Mouth about 65mm; umbilical blood vessels: 3, umbilical cord placenta inserted in the mouth outside the mouth of the cervix in essence. Ultrasonic tips: (1) single live fetus, about 22 weeks pregnant. (2) sail-like placenta, pre-vascular (Figure 1). 37 +5 weeks pregnant due to a small amount of vaginal bleeding cesarean section confirmed as a sail-like placenta, prevascular (Figure 2).