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正常怀孕时受精卵逐步发育,表面长出许多突起,形成早期绒毛,每一绒毛的周围由两层细胞组成,内层称绒毛膜滋养细胞(郎罕氏细胞),外层称合体细胞,此两层合称为“滋养叶细胞”。绒毛的中间部分称作“间质”。若怀孕后绒毛变性,绒毛突外围的“滋养叶细胞”增生,而中间的“间质”水肿,细胞退化及血管减少,绒毛失去吸收营养的功能,胚胎已死亡,且自溶而被吸收,子宫内没有胎儿,也没有胎盘,却充满了无数大小不等而透明的水泡,小的如米粒,大的象葡萄,细蒂相连,如成串的葡萄样,则称为葡萄胎,或称水泡状胎块。有时仅有一部分绒毛变成水
Normal pregnancy fertilized eggs gradually developed many protruding surface, the formation of early villi, each villus consists of two layers of cells around the inner chorionic trophoblast cells (Langerhans cells), the outer layer called somatic cells, which The two layers are collectively called “trophoblast cells.” The middle part of the fluff is called “interstitial”. If the villi degeneration after pregnancy, villi protruding peripheral “nourish leaf cells” hyperplasia, and the middle of the “interstitial” edema, cell degeneration and blood vessels, villi lose the function of absorbing nutrients, embryos have died, and autolyzed and absorbed, No fetus in the womb, no placenta, but full of countless sizes ranging from transparent blisters, small, such as rice, big like grapes, thin pedicle connected, such as string of grape-like, then called the mole, or Blister-shaped blocks. Sometimes only a few fluff turns into water