The embryo should be seen by the time the gestational sac measures 20mm, about five and a half weeks.

The gestational sac is located in the region of the ovary.

Common practice is to measure the size of the gestational sac and the embryo it contains.

Mean gestational sac diameter of at least 25 mm and no embryo.

Amniotic fluid is present from the formation of the gestational sac.

The tip of the catheter was positioned directly on the gestational sac.

With these very early abortions, we're talking about a whole gestational sac that's the size of a matchstick head.

The gestational sac is usually contained with the uterus.

In the US, a smaller gestational sac threshold of 16mm is adopted.

The gestational sac is the large cavity of fluid surrounding the embryo.

Two weeks later, the repeat ultrasound showed an empty gestational sac where a heartbeat should have been.

Ovarian tissue in the wall of the gestational sac is proved histologically.

When there is doubt about the results, physicians are advised to re-measure the gestational sac seven to 10 days later.

The gestational sac is attached to the uterus by the ovarian ligament.

By then, the gestational sac is usually simply called the "amniotic sac".

The presence of subchorionic bleeding around the gestational sac does not have a significant association with miscarriage overall.

About four hours later, in all likelihood, her body will expel the uterine lining and with it a gestational sac.

One study revealed an up to 20% variation in the size of gestational sacs reported by different clinicians measuring the same pregnancies.

Pelvic ultrasound reveals no gestational sac in the uterus.

Retroplacental hematomas are entirely behind the placenta and not touching the gestational sac.

Ultrasound will show the location of the gestational sac in the cervix, while the uterine cavity is "empty".

Gestational sacs can be identified via ultrasound and are generally identified by the following 4 characteristics:

An anembryonic gestation is characterized by a normal-appearing gestational sac, but the absence of an embryo.

By a week after the missed period this growing cavity becomes the first visible sign of pregnancy on transvaginal ultrasound: the gestational sac.

Aquino suffered a miscarriage with a collapsed gestational sac and blighted ovum on March 25, 2008.