After 27 hours in surgery, a pair of twin boys joined at the head have been successfully separated.
Anias and Jadon McDonald, both 13 months old, underwent the life-threatening operation at the Children’s Hospital in New York.
They are now recovering in hospital as they begin their new lives apart.
The separating procedure took around 16 hours, with another several hours of plastic surgery needed to rebuild the skulls and make them whole.
Dr Goodrich is one of the world’s leading experts on so-called craniopagus surgery. This was his seventh such surgery performed by Dr Goodrich and the longest. It is only the 52nd craniopagus separation surgery worldwide since 1952.
Parents Nicole and Christian decided to go ahead with the operation, even though it carried major risks, including death or long-term brain damage for the boys.
But 80 percent of twins joined at the head will die if not separated by age two.