Photos: Teenager has his partly formed unborn twin removed from his stomach after 15 years

A Malaysian teenager, Mohd Zul Shahril Saidin, 15, had a condition medically known as 'foetus in foetu', a very rare condition is where the malformed foetus is found in the body of its twin. He successfully underwent surgery to remove the mass which according to local media reports had hair, legs, hands and genitals.

His mum Hasmah Ahmad, 38, described the foetus as she expressed delight at her son's successful surgery, she said: 'The foetus removed from my son's stomach was formed with organs like those of a baby – only the nose and mouth were not complete.'

She has also reportedly 'accepted her son's fate', if the tumour truly was his twin.
Saidin never knew he carried his twin until recently when he was hospitalised after complaining of pain over the last four months.

His family performed the requisite funeral rituals and rites for the foetus.
It is estimated that 'foetus in foetu' occurs in 1 in every 500,000 live births.

During the early stages of pregnancy, if a woman is pregnant with twins, one of the babies can enter the other through the umbilical cord.

There, it becomes a parasite, depending on its sibling's body for survival.
Usually, it does not survive after birth, but can be life-threatening for the baby that does survive.