例1:李某,30岁,工人,主因孕27周,腹胀1个月,阵发性腹坠及见红5小时诊断先兆流产、慢性羊水过多急诊入院。分娩胎儿顺利,第三产程延长1小时10分钟胎盘仍未剥离,行徒手剥离胎盘术,检查胎盘长18厘米,宽15厘米,厚0.5厘米,重仅175克,病理组织检查诊断为膜状胎盘。 例2:王某,27岁,医师,因孕28周第一胎,头痛1周,浮 Example 1: Lee, 30 years old, workers, the main 27 weeks of pregnancy, abdominal distension for 1 month, paroxysmal abdominal collapse and see red 5 hours to diagnose threatened abortion, chronic amniotic fluid too much emergency admission. Third trimester extended 1 hour and 10 minutes the placenta is still not stripped, free hand stripping placenta, check the placenta length 18 cm, width 15 cm, thickness 0.5 cm, weighing only 175 grams, pathological examination diagnosed as membranous placenta . Example 2: Wang, 27 years old, physician, first pregnancy due to 28 weeks of pregnancy, headache 1 week, floating