A boy in Iraq who was born with three penises is the first child ever proven to have the strange deformity, doctors have claimed.

Doctors in the north of the country, near Mosul, believe they are the first to ever publish a study detailing a case of human triphallia – in which someone has three penises.

Only one was functional so the other two — attached to the shaft of his actual penis and bottom of his scrotum — were surgically removed.

The unidentified boy, a native Kurd from Duhok, was three months old when the tale was first published last year.

Doctors said one in every five to six million boys is born with more than one penis, with around 100 cases of diphallia – two penises – recorded worldwide.

But the Iraqi boy is the first to have triphallia, according to the case report published in the International Journal of Surgery Case Reports.

One case in India went viral in 2015 but experts could not verify the tale because it was never detailed in a medical journal.

The boy’s parents initially took him into hospital because of swelling in his scrotum, but when he arrived doctors noticed the boy had two extra penises.

One measured 2cm and was located at the root of his main penis, while the other was 1cm long and positioned below his scrotum.

They looked into whether the child had been exposed to drugs during pregnancy or if he had a family history of genetic abnormalities but neither were the case and the cause of the condition was a mystery.

Urologists found neither of the extra penises had a urethra, the tube that urine passes through, and decided surgery was the best option.

No problems were found on a follow-up visit a year after the operation, according to Dr Shakir Saleem Jabali, the author of the report.

Scientists are still baffled over the cause of supernumerary penises – the technical name for the extra members – the first case of which was reported in the 1600s.

Daily Mail