Newly born conjoined twins with two heads but one body were in stable condition Friday in a Hong Kong hospital with a good chance of survival, a doctor said.

The two boys, born Thursday, have two spines but only one pair of legs and one pair of arms, said Professor C.Y. Yeung, head of the Queen Mary Hospital's pediatrics department.Yeung said an operation to separate the twins, who weighed nine pounds at birth, was "almost impossible."

He said, "So far they have a good chance to survive but cases like that may have underlying problems in the future."

Yeung refused to give more details about the twins or identify them. He said it was up to the parents to decide whether more information should be released.