Not such a big man: Adolf Hitler suffered from a condition that is thought to have left him with a tiny penis – as well as only having one testicle, according to historians

He was famously said to only have one ball.

But now Adolf Hitler is also thought to have had a tiny manhood.

According to two historians, the Fuhrer suffered from hypospadias, a condition that can leave a man with a 'micro-penis'.

It can also mean the sufferer has to urinate out of a hole at the base or underside of the shaft instead of the tip.

The revelations come two months after a German historian claimed medical records showed that Hitler really did only have one testicle – as claimed in famous song The Colonel Bogey March.

Prison documents show Hitler was examined by Dr Josef Brinsteiner in 1923 – and was found to have suffered from an undescended right testicle, according to Professor Peter Fleischmann.

Now in the new book Hitler's Last Day: Minute by Minute, historians Jonathan Mayo and Emma Craigie claim he also suffered from a second deformity, it was reported by The Daily Star.

They wrote: 'Hitler himself is believed to have had two forms of genital abnormality: an undescended testicle and a rare condition called penile hypospadias in which the urethra opens on the under side of the penis.'

The two conditions would go a long way to explaining why the tyrant had a fear of being seen naked and could account for his deep-seated fury.

His personal doctor Theodor Morell, a qualified urologist, is also believed to have noted Hitler's hypospadias.

He is also understood to have given him hormones, amphetamines and cocaine in a bid to boost his sex drive with partner Eva Braun.

In December, researchers from the University of Erlangen say they had found documents that appeared to back up the claim that Hitler only had one testicle, long considered a myth.

Asleep on the job: The conditions would go a long way to explaining why the tyrant had a fear of being seen naked and his need for hormones and cocaine to boost his sex drive with partner Eva Braun (above)

With hypospadias, the urethra emerges somewhere on the shaft or even the base of the penis, instead of at the tip. If the head of the penis is tipped backwards, it can make it impossible to urinate while standing

WHAT ARE HYPOSPADIAS? With hypospadias, the urethra - through which urine is expelled - emerges somewhere on the shaft or even the base of the penis, instead of at the tip. Sometimes the head of penis is tipped backwards, making it impossible to urinate standing. The condition (pronounced as hi-poe-SPAY-dee-usis) is also linked with undescended testes, so sometimes the man is infertile. About 1 in 300 boys are born with some degree of hypospadias and those affected by it can have smaller-than-average penises or even a micro-penis. It is not known what causes it, although sometimes it runs in families. Many affected men never know they have a recognised condition and their parents never seek help, so doctors have been prevented from tracing inheritance patterns. The numbers affected have more than doubled in a generation, making it as common as cleft palate and hare lip. Advertisement

His 'right-side chryptorchidism' was uncovered while he was in prison in 1923 after his failed Beer Hall Putsch, Fleischmann told Bild, according to the Local.

The condition occurs when one or both testicles fail to descend during childhood.

Sung to the tune of The Colonel Bogey March, the old wartime song had it that Hitler only had one testicle.

The morale-boosting ditty emerged at the beginning of the Second World War as part of moves to ridicule the Fuhrer and his fellow leaders.

It is not the first time the song's content has been addressed.

For decades it was alleged that Hitler had lost his testicle at the battle of the Somme during the First World War.

The lyrics go: 'Hitler has only got one ball, the other is in the Albert Hall. His mother, the dirty b****r, cut it off when he was small.'

There were even tales of the infant Hitler having his penis bitten off by a goat into whose mouth he was attempting to urinate.