"At first we saw that the boy’s organs were squeezed by a large hard swelling covered with black hair,” one surgeon told a British newspaper. “As we washed him, we could see that inside him he had his own twin brother. Mourat had been a Siamese twin but nobody knew it. “Something had gone wrong during his mother’s pregnancy and the baby grew inside his brother."

BBC NEWS | Health | Boy ‘pregnant’ with twin brother