A calcified foetus has been discovered inside the body of an elderly Chilean woman - and doctors think it has been there for 50 years.

Medics found the foetus when the woman, who is at least 90, was taken to hospital after a fall, Chilean media reported.

X-rays showed a 2 kilo (4.4lb) foetus, thought to have died during pregnancy, inside the woman's abdomen and outside her uterus.

Doctors are unlikely to remove the foetus because of the woman's age. She has now been sent home from hospital.

The phenomenon, known as 'lithopedion', occurs when the foetus dies during pregnancy and then calcifies outside the womb.

Hospital director Margo Vargas Lazo spoke to the Efes news agency in Chile about the discovery, calling it "extraordinarily rare".