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.
Dr Jabali argued each case had a ‘unique presentation’.
Writing in the journal, he said: ‘To the best of our knowledge, this is the first reported case with three penises or triphallia.
‘No similar case is present in literature in human beings.’
The condition is associated with other abnormalities, including being born with two scrotums or anuses.
There have been reports of boys being able to urinate and ejaculate out of both penises.
But in this case the boy’s extra penises were non-functional and so surgery was less complicated.
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