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A 17-year-old boy has undergone the world's first penis reduction surgery, surgeons claim.

The American teen requested the surgery after his penis grew too large, restricting his ability to have sex or play competitive sports.

The boy's surgeons were shocked when he came to them complaining that his penis was too big. 

When flaccid, it measured almost seven inches in length and had a circumference of 10 inches - around the size of a grapefruit.