An 82-year-old woman went to the doctor's complaining of stomach pains to be told she had a 40-year-old foetus inside her.
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At first, doctors thought the elderly woman's complaint was gastroenteritis.
But after checks, medics at Tunjuelito Hospital in Bogota, Colombia, discovered that it was in fact a rare lithopedion – or stone baby.
The phenomenon occurs when a baby dies during an abdominal pregnancy but is too large to be reabsorbed by the maternal body, and is instead encased in calcium.
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The woman had arrived at the hospital complaining of diarrhoea, on Monday this week, and has now been transferred for surgery.
More on Parentdish: Two-year-old has operation to remove unborn twin from his stomach