Does a blighted ovum have a yolk sac?

A blighted ovum, also known as an anembryonic pregnancy, occurs when a fertilized egg implants in the uterus but does not develop into an embryo. In this condition, a yolk sac may still be present, as the placenta and yolk sac can develop even if there is no embryo. However, the presence of a yolk sac alone is not indicative of a viable pregnancy, as it often indicates that the pregnancy is non-viable.