单绒毛膜单羊膜囊双胎妊娠中的卵黄囊数量、大小及形态特征
Yolk sac number, size and morphologic features in monochorionic monoamniotic twin pregnancy.
作者信息
Levi C S, Lyons E A, Dashefsky S M, Lindsay D J, Holt S C
机构信息
Section of Diagnostic Ultrasound Health Sciences Centre, Winnipeg, Man.
出版信息
Can Assoc Radiol J. 1996 Apr;47(2):98-100.
OBJECTIVE
To determine the relation between three characteristics of the yolk sac (number, size and morphologic features) and outcome in monochorionic monoamniotic twin pregnancy.
METHODS
The authors reviewed data for the four sets of monochorionic monoamniotic twins detected by first-trimester ultrasonography between January 1990 and June 1994 at their institution. Data analysed included yolk sac number, size and morphologic features, as well as the outcome of the pregnancy.
RESULTS
In all four sets of twins, only one yolk sac was identified. In one case the yolk sac was irregular in contour, and in two it was abnormally large. Two of the four mothers delivered healthy twins at 34 weeks gestational age, one had conjoined twins ( and underwent elective termination of the pregnancy), and one had a twin ectopic pregnancy (and underwent salpingectomy).
CONCLUSION
A single yolk sac in cases of monochorionic monoamniotic twins may be a normal finding.
目的
确定单绒毛膜单羊膜囊双胎妊娠中卵黄囊的三个特征（数量、大小和形态特征）与妊娠结局之间的关系。
方法
作者回顾了1990年1月至1994年6月期间在其机构通过孕早期超声检查发现的四组单绒毛膜单羊膜囊双胎的数据。分析的数据包括卵黄囊的数量、大小和形态特征，以及妊娠结局。
结果
在所有四组双胎中，仅发现一个卵黄囊。其中一例卵黄囊轮廓不规则，两例卵黄囊异常大。四位母亲中有两位在孕34周时分娩出健康双胎，一位怀有联体双胎（并接受了选择性妊娠终止），一位怀有双胎异位妊娠（并接受了输卵管切除术）。
结论
单绒毛膜单羊膜囊双胎病例中出现单个卵黄囊可能是正常发现。
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