A blighted ovum is a pregnancy in which the embryo never develops or is reabsorbed. Learn about the causes, symptoms, diagnosis and treatment of this condition, as well as the difference between anembryonic and embryonic pregnancy. Learn about the early signs of a blighted ovum, how it is diagnosed, and what treatment options are available to manage this early pregnancy loss. A blighted ovum, also known as an anembryonic pregnancy, describes a particular type of pregnancy loss or miscarriage. Find out more. Learn what a blighted ovum is, how it occurs, and what are the treatment options. A blighted ovum is when a fertilized egg fails to develop into an embryo, leading to miscarriage in early pregnancy.