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羊膜囊脱垂的发生原因是子宫颈内口松弛。正常妊娠在足月前,子宫颈内口是关闭的。通常至分娩第一期时,子宫颈管方扩张消失,而便于胎儿娩出。子宫颈内口可因分娩、手术产、刮宫、活体组织检查等,在扩张宫颈时而被损伤,也可能是因先天性结构异常,也许还包括子宫颈生理异常在内,子宫颈内口可以发生松弛。这些病人在受孕后,特别是在中期妊娠后,因胎儿成长、羊水增多、宫内压增高,羊膜囊可自宫颈内口脱垂突出。妇科检查可发现子宫颈内口松弛,常能见到露出的羊膜。通常患者无甚不适,也不会有显著的阴道出血,但娩出的多系无畸形但未成熟的胎儿。因此子宫颈内口松弛和羊膜囊脱垂是晚期习惯性流产的原因之一。
Amniotic cyst prolapse occurs because the cervix is loose. Normal pregnancy before term, the cervix is closed. Usually to the first period of childbirth, the cervix disappears, and facilitate the delivery of the fetus. Cervical internal mouth can be due to labor, surgical production, curettage, biopsy, etc., are sometimes damaged in the expansion of the cervix, may also be due to congenital structural abnormalities, and may also include cervical physiological abnormalities, including the cervix can occur relaxation. These patients after conception, especially in the second trimester, due to fetal growth, increased amniotic fluid, increased intrauterine pressure, amniotic sac can be prolapsed from the mouth of the cervix prominent. Gynecological examination can be found in the cervix loose mouth, often can see the exposed amniotic membrane. Usually patients are not uncomfortable, there will be no significant vaginal bleeding, but the delivery of more non-deformity but immature fetus. Therefore, the relaxation of the cervix and amniotic sac prolapse prolapse is one of the reasons for the late habitual abortion.