An extraordinary account from a German army medic has finally confirmed what the world long suspected: Hitler only had one testicle.

War veteran Johan Jambor made the revelation to a priest in the 1960s, who wrote it down.

The priest’s document has now come to light –- 23 years after Jambor’s death.

The war tyrant’s medical condition has been mocked for years in a British song.

The lyrics are:

"Hitler has only got one ball, Göring has two but very small, Himmler is somewhat sim'lar, But poor old Goebbels has no balls at all.

Hitler has only got one ball, The other is on the kitchen wall, His mother, the dirty b——r, Chopped it off when he was small."

Until now there has never been complete proof Hitler was monorchic — the medical term for having one testicle.

But the document tells how Jambor saw the proof with his own eyes. In the account, he relives the horror of serving as an army medic in World War I.

He died aged 94 in 1985, but had told his secret to priest Franciszek Pawlar, who kept a note of their conversation.

Johan’s friend Blassius Hanczuch confirmed the priest’s account of how the medic saved Hitler’s life. He said: “In 1916 they had their hardest fight in the Battle of the Somme.

“For several hours, Johan and his friends picked up injured soldiers. He remembers Hitler.

“They called him the 'Screamer.' He was very noisy. Hitler was screaming ‘help, help.'

“His abdomen and legs were all in blood. Hitler was injured in the abdomen and lost one testicle. His first question to the doctor was: ‘Will I be able to have children?'"

Hitler’s genitals have long caused controversy. Some historians dismissed the “one ball” song as propaganda. But an alleged Soviet autopsy on Hitler backed it up.

Records show Hitler did suffer a groin injury in the Somme.

Click here to read more from The Sun.