Adolf Hitler had a genital deformity that made his penis remarkably small, according to a historian citing previously unknown medical records.

It had been long acknowledged that the fascist had an undescended testicle, but the new revelation could shed light on his maniacal personality.

“Hitler himself is believed to have had two forms of genital abnormality: an undescended testicle and a rare condition called penile Hypospadius in which the urethra opens on the underside of the penis,” according to historians Jonathan Mayo and Emma Craigie’s book “Hitler’s Last Day: Minute by Minute.”

The condition is often accompanied by an undescended testicle, according to the US Centers for Disease Control and Prevention.

Patients “could have problems with abnormal spraying of urine and might have to sit to urinate,” according to the CDC’s description of the deformity.

“In some boys with hypospadias, the testicle has not fully descended into the scrotum. If hypospadias is not treated it can lead to problems later in life, such as difficulty performing sexual intercourse or difficulty urinating while standing.”

The dictator’s personal doctor Theodor Morell used to give Hitler hormones, amphetamines and cocaine in hopes of boosting the Fuehrer’s sex drive, historians said.

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