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正常妊娠卵黄囊（ＹＳ）是绒毛腔内的一个继发的胚外结构，使用经阴道超声可于孕５Ｗ检测到，于孕１２Ｗ消失，它是一个圆盘状的与胚胎密切连接的带蒂的半透明结构。自然流产（ＳＡ）是一种常见的妊娠并发症，约占总妊娠的１５％～２０％，最新统计资料有增高趋势。最近几年，
The normal pregnancy yolk sac (YS) is a secondary extraembryonic structure in the villous cavity. Transvaginal ultrasound can be detected at 5 weeks of pregnancy and disappears at 12 weeks of pregnancy. It is a disk-shaped pedicle closely linked to the embryo Translucent structure. Spontaneous abortion (SA) is a common pregnancy complication, accounting for about 15% to 20% of the total pregnancy, the latest statistics have an increasing trend. Last few years,