This video shows a Blighted ovum also known as Anembryonic pregnancy.
A blighted ovum is a fertilized egg that implants itself in the uterus but doesn't become an embryo. The placenta and embryonic sac form, but remain empty. There's no growing baby. It's also known as Anembryonic gestation or anembryonic pregnancy. It is a leading cause of early pregnancy failure or miscarriage. Often it occurs so early that you don't even know you are pregnant.
It is also called an 'anembryonic pregnancy' as there is no embryo (developing baby). Because a blighted ovum still makes hormones, it can show up as a positive pregnancy test. A blighted ovum will cause a miscarriage usually at 7 to 12 weeks of pregnancy.
A pregnancy is anembryonic if a transvaginal ultrasound reveals a sac with a mean gestational sac diameter (MGD) greater than 25 mm and no yolk sac, or an MGD more than 25 mm with no embryo.
A blighted ovum causes about one out of two miscarriages in the first trimester of pregnancy. A miscarriage is when a pregnancy ends on its own within the first 20 weeks. When a woman becomes pregnant, the fertilized egg attaches to the uterine wall. At about five to six weeks of pregnancy, an embryo should be present.
A blighted ovum, also called an anembryonic pregnancy, occurs when an early embryo never develops or stops developing, is reabsorbed, and leaves an empty gestational sac. The reason this occurs is often unknown, but it may be due to chromosomal abnormalities in the fertilized egg.
The gestational sac is typically visible on a transvaginal ultrasound somewhere between 3 to 5 weeks of pregnancy, or by the time the hCG has reached 1500 to 2000. Before that, even in a viable pregnancy, there is not going to be a visible gestational sac on an ultrasound.
Doctors can diagnose a blighted ovum using an ultrasound starting at around week 7 of pregnancy. Imaging will show a smaller than normal and empty gestational sac, which contains no embryo.
Because a blighted ovum still makes hormones, it can show up as a positive pregnancy test. A blighted ovum will cause a miscarriage usually at 7 to 12 weeks of pregnancy. Your body realizes the pregnancy is not developing properly and starts to shed blood and tissue from the uterus.
The gestational sac is the large cavity of fluid surrounding the embryo. During early embryogenesis it consists of the extraembryonic coelom, also called the chorionic cavity. The gestational sac is normally contained within the uterus.
One of the more common types of miscarriages, known as an anembryonic pregnancy with an empty sac.
In a blighted ovum, a gestational (embryo) sac forms and grows; however, the embryo does not develop. A blighted ovum is also known as anembryonic pregnancy. In the United Kingdom, miscarriage is the loss of an intrauterine gestational sac diameter (MGD) greater than 25 mm and no yolk sac.
The fetal pole is usually identified at 6.5 weeks with transabdominal ultrasound imaging and at 6 weeks with transvaginal ultrasound imaging, although it may not be seen until 9 weeks in some cases. When the fetal pole measures 7 mm or more, a fetal heartbeat should be detected.
The yolk sac is a membranous sac attached to an embryo, formed by cells of the hypoblast adjacent to the embryonic disk. This is alternatively called the umbilical vesicle by the Terminologia Embryologica (TE), though the yolk sac is far more widely used. In humans, the yolk sac is important in the early embryonic blood supply.
When in a follow-up ultrasound there's still no sign of a fetal pole (or of a gestational sac, which appears as a white rim around a clear center and will eventually contain amniotic fluid and enclose the developing baby) it means a miscarriage has occurred.
The fetal pole is a thickening on the margin of the yolk sac of a fetus during pregnancy. It is usually identified at six weeks with vaginal ultrasound and at six and a half weeks with an abdominal ultrasound. However, it is quite normal for the fetal pole to not be visible until about 9 weeks.

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