Erin and Abby Delaney were born in joined at the head -- a rare condition called craniopagus. Conjoined twins occur when, in the early stages of development, an embryo only partially separates to form two babies. Conjoined twins are rare, occurring in about one out of everylive births, experts say. But surgical teams are increasingly capable of separating many such pairs, putting the rare condition in the spotlight. The Delaney twins were separated on June 6,by a member surgical team at Children's Hospital of Philadelphia. The surgery took 11 hours. Vani and Veena, seen here in in Hyderabad, India, inare craniopagus twins, which means they were conjoined twins penis
joined at the head -- making separation conjoined twins penis.