□超声诊断标准:脐静脉直径为>9mm;肝下脐静脉直径>肝内脐静脉直径的1.5倍(Weissman et al., 1994)。□诊断切面:上腹部横切面、腹部正中矢状切面、腹部冠状切面等三个切面,可显示腹内脐静脉;腹外脐静脉的显示,顺着脐带长轴纵切面和横切面观察;脐带腹壁附着部位、脐带胎盘附着部位近端的显示,使用经脐腹部横切和矢状切面,以及脐带胎盘附着的相应切面大多效果好,而两处附着部位以远脐静脉的显示受多因素影响,敏感性不佳。□腹内段UVV声像表现:胎儿上腹部卵圆形薄壁囊状结构,该结构与脐静脉相通,内为静脉血流,若彩色多普勒显示该结构内血流信号缺损,则为血栓形成。□腹外段UVV声像表现:脐带内卵圆形薄壁囊状结构,该结构与脐静脉相通,内为静脉血流,若彩色多普勒显示该结构内血流信号缺损,则为血栓形成。
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