Eight-month-old twin boys from Madagascar who had been joined at the throat and stomach were successfully separated Wednesday in Paris and were in good shape, hospital officials said Thursday.
The brothers, named Imahaga and Imahalatsa, were born in a village in southern Madagascar near the town of Fort Dauphin.
They underwent a six-hour operation led by surgeon Yann Revillon at the Necker Hospital for Sick Children.
The 20-strong team, which included six surgeons and four anaesthetists, took two hours to prepare for the operation, a statement said.
"It went very smoothly," said Revillon, speaking to reporters.
A day after the operation, the two children were breathing with modest respiratory assistance and were doing well, although one had a slight fever, he said.
Separation gave each child a "virtually normal liver," an organ that regenerates, and the operational wound on the throat was patched with skin, he added.
He expected the two to have a "completely normal" life expectancy.
In 2001 Revillon also separated conjoined girls from Britain, the statement added.
Ninety percent of conjoined twins are girls. The condition is rare, occurring in approximately one in 100,000 live births.
It occurs when the single egg from which identical twins develop fails to divide properly after conception.
Most cases occurs in women aged 25 to 40 years old. The survival rate is between five and 25 percent.
Imahaga and Imahalatsa together weighed 2.8 kilos (6.1 pounds) at birth and weigh a total of 11 kilos (24.2 pounds) today.
The names of the twins are synonyms for "It's astonishing," doctors said.