中期妊娠孕妇葡萄胎使此期子宫明显增大。超声检查显示没有胎儿，仅是一个“暴风雪”效应。
This is only a second trimester pregnancy, but note how large for dates the uterus is because of a molar pregnancy. An ultrasound in this case revealed no fetus, only a "snowstorm" effect.
