Abstract：
Placenta membranacea is an uncommon placental anomaly. Here, we present the case of a 30-year-old primiparous woman admitted for thickened placenta and reduced amniotic fluid. A follow-up ultrasound, performed after 48 h, revealed that the placental parenchyma was thin and not adequately visualized, enclosing a substantial volume of flowing blood (150 mm), with an amniotic fluid index of 18 mm. An emergency cesarean section was promptly performed. Following fetal delivery, a substantial accumulation of dark red blood within the fetal membranes created a \"blood bag\", estimated at approximately 3000 ml. This observation aligned with the ultrasound findings, and both placental morphology and pathological results substantiated the diagnosis of placenta membranacea.
摘要：
胎盘膜是一种罕见的胎盘异常。这里,我们介绍了一例30岁的初产妇，因胎盘增厚和羊水减少而入院。超声随访,48小时后进行，显示胎盘薄壁组织薄，没有充分可视化，封闭大量流动的血液（150毫米），羊水指数为18毫米。及时进行了紧急剖宫产。胎儿分娩后，大量的深红色血液积聚在胎膜内形成了一个“血袋”，估计约3000毫升。这一观察结果与超声检查结果一致，胎盘形态和病理结果均证实了胎盘膜的诊断。
