Weird: Unborn twin protrudes from sister's back

A mystery as a large mass grows on girl's back which contained a breast and an arm with two fingers. Doctors said it was part of an identical twin that had failed to develop and was enveloped in her.

The case was reported in a British journal by doctor based in Beijing, China. The case also came to the attention of the medical world after it was studied by Professor Baogan Peng, of the General Hospital of Armed Police Force in Beijing.
Doctors were astonished after an 11-year-old schoolgirl was admitted to a hospital in China with a third arm sprouting out of her back. Research revealed that part of an identical twin had failed to develop and had been enveloped into the body of its sister. Further investigation found it consisted of a breast and an arm which included a shoulder blade and two fingers.
However, the 11-year-old Chinese girl has a malformed parasitic twin on her back. Prof Peng said: 'Based on physical examination and imaging findings, a diagnosis of fetus in fetu was made preoperatively.'
Fetus in fetu is a condition where the malformed foetus is found in the body of its twin. The foetus is found in the abdomen in 80 per cent of cases, there are also reports of it occurring in the skull. So, this is the first time that is has been reported in the back.