An 82-year-old woman in Colombia was searching for the cause of her horrible stomach pain when her doctors stumbled upon a 40-year-old reason. Inside her was a 40-year-old "stone baby," the remnants of a fetus that had implanted outside her womb, grown a bit, and then calcified. Horrifying, right? And it's not the first time it has happened.
Still, it is exceedingly rare. There are only 300 documented cases from around the world of this condition called lithopedion. Basically, a fetus develops – and dies – outside of the uterus usually in the abdominal cavity. At that point, if it is too large to be absorbed back into the body, the fetus calcifies in order to protect the woman's body from dead tissue.
In this woman's case, it was discovered because her doctor ordered an abdominal x-ray. It had been there since she was 42. How insane is that?