单词vasa-previa
网络: 血管前置；前置血管；胎盘血管前置
MethodRetrospective analysis of clinical data of the past five years in 12 cases of velamentous placenta attached with vasa previa.
方法：采用回顾性方法分析近五年来12例帆状胎盘并血管前置的临床资料。