单羊膜囊双胎两胎儿脐带互相打结,胎儿死亡率较高,存活者罕见。我院曾遇到一例,现报道如下: 患者,23岁,孕1产0。孕38周有不规则宫缩入院。检查:腹部较一般足月妊娠为大,宫底高31cm,腹围96cm,诊断双胎,两胎头均在下方,其中一胎儿入盆,胎位为右枕前,另一胎头未入盆。骨盆外内测量径线值均正常。内诊:外阴、阴道发育正 Single amniotic sac twins two umbilical cord knot each other, high fetal mortality, survivors rare. Our hospital has encountered a case, are reported as follows: The patient, 23 years old, pregnant 1 produce 0. 38 weeks pregnant with irregular contractions in hospital. Examination: The abdomen is more than normal full-term pregnancy is large, palace bottom height 31cm, abdominal circumference 96cm, diagnosis of twins, two fetal head are below, one of the fetus into the basin, the fetal position for the right occipital, another fetal head into the basin . Pelvic diameter measurements were normal outside diameter. Internal consultation: vulva, vaginal development is positive