The Yolk SacAnembryonic pregnancy is a form of early pregnancy failure, in which the developing, but the embryo is not formed. The term is synonymous with a blighted ovum is, but fell out of favor and should be avoided.
The patient may be asymptomatic, presenting to an ultrasound early in pregnancy. Or, he may present with vaginal bleeding in early pregnancy. Because hCG levels fall, clinical signs of pregnancy tend to subside.
In pregnancy anembryonic, formed from the fertilized egg, but never developed, although histologically some fetal material can be shown in many cases.
Human chorionic gonadotropin () formed due to the invasion of the endometrium by the syncytiotrophoblast, and as a result, there is a positive pregnancy test and clinical signs of pregnancy are present.
Pregnancy anembryonic can be diagnosed:
or
Rating growth average interval sac diameter (MSD) has proven to be less accurate in the diagnosis of pregnancy anembryonic, because of overlap superimposed on the growth rate of gestational sac viable and non-viable.
Other additional features have been described, and can be considered poor prognostic factors, but does not contribute to the formal diagnosis of pregnancy failed. These include:
The condition that causes the appearance of a cover:
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