What Are Conjoined Twins
Conjoined twins are identical twins whose bodies are physically connected at birth. They occur in roughly 1 in 50,000 to 1 in 100,000 births, according to the National Institutes of Health. The condition arises when a single fertilized egg only partially separates during early development.
Causes of Death in Conjoined Twins
Conjoined twins die most often because of shared organs, abnormal blood vessel connections, or severe congenital malformations. In many cases, both twins cannot survive independently, and one or both may die before or shortly after delivery. Complications such as heart failure, infection, or surgical risks during separation attempts also contribute to mortality.
Survival and Medical Outcomes
Survival rates for conjoined twins are low overall, and many pregnancies end in stillbirth or early neonatal death. When separation surgery is possible, outcomes depend on which organs are shared and how complex the anatomy is. Medical teams carefully evaluate risks, and some families choose palliative care when separation is not viable.
