Please confirm that you are a health care professional
The link you have selected will take you to a third-party website. We do not control or have responsibility for the content of any third-party site.
The anechoic (black) yolk sac moves throughout the uterine horns and body from day 6–16 of gestation. A specular reflector (white dash) is imaged at the dorsal and ventral aspect of the yolk sac.
Courtesy of Dr. Patricia Sertich.