Girl found with twin infant in stomach

In a rare case, a girl was found to have her own twin inside her stomach in a tumour. Doctors have estimated that the case in which one baby in a womb absorbs the other to be as low as 2 in a million, and it is a surprise when they actually see it happening. It is even more surprising that this was only found when she was 9 years old and complained of a pain in the stomach:

A nine-year-old girl who went to hospital suffering from stomach pains was found to be carrying her embryonic twin, doctors in central Greece said Thursday. Doctors at Larissa General Hospital examined the girl and surgically removed a growth they later discovered was an embryo about six centimeters (more than two inches) long.
Andreas Markou, head of the hospital's pediatric department, said the embryo was a formed fetus with a head, hair and eyes, but no brain or umbilical cord.