超声可以直接观察到一些明显的结构性病变标志,如无脑儿、腹裂等,还可以观察到一些更微小的、常常是一过性的结构改变,它本身也许是无意义的,但可能提示存在着严重的胎儿异常的风险,这些超声表现被称为胎儿“超声软标志”(soft markers)。中孕期的胎儿超声软标志与唐氏综合征和 Ultrasound can be directly observed some obvious signs of structural disease, such as no brain, abdominal cracking, etc., but also observed some of the more minor, often transient structural changes, which may itself be meaningless, but may be Suggesting that there is a serious risk of fetal abnormalities that are known as fetal “soft markers.” Fetal ultrasound during pregnancy with soft sign and Down Syndrome