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The mean sac diameter [3] can effectively estimate the gestational age [4] between 5 and 6 weeks, with an accuracy of about +/- 5 days. [ 5 ] The yolk sac and embryo should be readily identifiable when the gestational sac reaches a certain size — a yolk sac should be seen when the gestational sac is 20mm and a fetal pole should be seen when ...
Early obstetric ultrasound, comparing the size of an embryo or fetus to that of a reference group of pregnancies of known gestational age (such as calculated from last menstrual periods) and using the mean gestational age of other embryos or fetuses of the same size. If the gestational age as calculated from an early ultrasound is contradictory ...
Amniotic sac seen adjacent to yolk sac, and with no visible embryo. [110] [111] Yolk sac of more than 7 mm. [110] [111] Small gestational sac compared to embryo size (less than 5 mm difference between mean sac diameter and crown-rump length). [110] [111]
Gestational sac size, location, and number; Identification of the embryo and/or yolk sac; Measurement of fetal length (known as the crown-rump length) Fetal number, including number of amnionic sacs and chorionic sacs for multiple gestations; Embryonic/fetal cardiac activity; Assessment of embryonic/fetal anatomy appropriate for the first trimester
Transvaginal ultrasonography showing a gestational sac with a diameter of 28 mm, corresponding to a gestational age of approximately 7 weeks and 5 days. It contains a yolk sac (protruding from its lower part) but no embryo, even after scanning across all planes of the gestational sac, thus being diagnostic of an anembryonic gestation. Specialty ...
The rectouterine (or recto-uterine) pouch is also called the rectouterine excavation, uterorectal pouch, rectovaginal pouch, pouch of Douglas (after anatomist James Douglas, 1675–1742), Douglas pouch, [6] Douglas cavity, [6] Douglas space, [6] Douglas cul-de-sac, [6] Ehrhardt–Cole recess, Ehrhardt–Cole cul-de-sac, cavum Douglasi, or excavatio rectouterina.
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The amniotic sac, also called the bag of waters [1] [2] or the membranes, [3] is the sac in which the embryo and later fetus develops in amniotes. It is a thin but tough transparent pair of membranes that hold a developing embryo (and later fetus) until shortly before birth .