1病例介绍许某，女，26岁。于1996年4月10日因妊娠38周，第1胎，羊水过多入院。既往月经规律，孕期经过顺利，无用药史及放射线接触史。孕晚期曾2次B超提示胎盘异常（血管瘤）。入院前3周宫底增长较快，平卧时感呼吸困难。入院查体温、脉搏、呼吸、血压、心肺均正常。肝脾未触 1 Case Introduction Xu Mou, female, 26 years old. On April 10, 1996, due to 38 weeks of gestation, the first child was admitted to the hospital with polyhydramnios. The previous menstrual regularity, the pregnancy progressed smoothly, the history of drug use and the history of radiation exposure. In the third trimester of pregnancy, there were 2 B-ultrasounds that indicated abnormal placenta (hemangioma). In the 3 weeks before admission, the fundus grew rapidly, and it was difficult to breathe when lying flat. On admission, body temperature, pulse, respiration, blood pressure, and heart and lung were all normal. Liver and spleen are not touched