A woman held onto a dead fetus inside of her womb for 50 years. At the age of 92 she discovered the mummified fetus within her after she experienced a fall. This is a biological processed mummy was not intended to become one. The unborn child still exists inside of her due to her age.
This was all plausible because of a disease called lithopedion. This occurs when a fetus dies and then mummifies outside the uterus. It becomes calcified within the womb since it is too big to be reabsorbed by the body. The body calcifies it in order to shield the mothers body from infection.