Gestational sac
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. It is the only available structure that can be used to determine if an intrauterine pregnancy exists until the embryo can be identified.
| Gestational sac | |
|---|---|
Contents in the cavity of the uterus seen at approximately 5 weeks of gestational age by obstetric ultrasonography. | |
Artificially colored, showing gestational sac, yolk sac and embryo (measuring 3 mm as the distance between the + signs). | |
| Details | |
| Carnegie stage | 6a |
| Days | 12 |
| Precursor | Heuser's membrane |
| Identifiers | |
| Latin | saccus gestationalis, coeloma extraembryonicum, cavitas chorionica |
| MeSH | D058746 |
| TE | sac_by_E5.8.0.0.1.0.1 E5.8.0.0.1.0.1 |
| Anatomical terminology | |
On obstetric ultrasound, the gestational sac is a dark (anechoic) space surrounded by a white (hyperechoic) rim.
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