A Chinese girl dubbed the "angel with wings" because of a third arm growing out of her back has undergone life or death surgery at a military hospital in Beijing.

Ren Xin's operation was successful.

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A large team of doctors, neuro- and plastic surgeons and orthapedic specialists carried out an operation to remove the extra limb from 11-year-old Ren Xin.

Sky's China correspondent Peter Sharp said the expressions on the doctors' faces suggested it had gone well.

The extra arm came from an undeveloped parasitic twin.

Surgery was complicated because the parasite's spine was fused with Ren Xin's and a major blood vessel from it was connected to her organs.