A woman in northwest China's Shaanxi Province recently gave birth to twin brothers, but the elder boy was later found to have another fetus in his abdominal area, local media reported.

The baby boy was born "pregnant" with another fetus.

The twin brothers were born prematurely in Xi'an, provincial capital of Shaanxi. The elder boy weighed about two kilograms at birth. When doctors checked a mass in his abdominal area, they discovered to their surprise that it looked like a fetus with bones and nails.

What happened to the baby is known as fetus in fetu, an incredibly rare occurrence which affects only one in every 500,000 births.

The third fetus was taken out 15 days after the boy was born. The cause of the condition remains unknown.

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