A DOCTOR insists the man with the world’s biggest penis could be stretching the truth.

Roberto Esquivel Cabrera, from Saltillo, Mexico, has a 18.9 inch penis - believed to be the largest in the world.

4 Roberto Esquivel Cabrera has the world's biggest penis, measuring a whopping 18.9 inches

But radiologist Dr Jesus Pablo Gil Muro, who has examined Roberto, has thrown the world record claims into doubt.

His comments have emerged from an interview with Barcroft TV earlier this year. These have borne new significance after the man with the second largest penis in the world argued Roberto’s todger was not what it made out to be.

Dr Muro said: "When he came here to do a CT scan, my first impression was that it was a unique and unusual case.I had never seen a patient like Roberto.”

But when he came to examine it, Roberto refused to take off all the bandages and would not let him see the skin.

4 But Cabrera could soon be flown out to Prague to become the star of a series of 'comical' x-rated films

Yet a CT scan was to make revelations.

He said: "What the CT scan showed was that there is a very large foreskin. It goes just before the knee.

"But the penis itself is about 16 to 18cm from the pubis.

“So, it doesn't go all the way through the foreskin.

"The rest of the tissue found there is just foreskin, blood vessels, and some inflammation of the skin."

4 A CT scan is said to show foreskin which has been stretched Credit: BARCROFT

It then emerged Roberto had talked to his psychiatrist and revealed he had began enlarging his willy since he was a teenager.

“He was obsessed with the penis length,” said Dr Muro.

It is understood 54-year-old Roberto has been stretching it with weights since he was a teenager.

The claims of cheating comes after the man with the second-largest penis called into question the world record.

The comments have emerged from an interview with Barcroft TV, which have borne new significance from claims from the man with the second-largest penis in the world that Roberto’s todger is not what it cracked up to be.

4 Radiologist Dr Jesus Pablo Gil Muro believes the length is not all penis Credit: BARCROFT

Roberto Esquivel Cabrera the man with world’s longest penis REJECTS reduction op

MOST READ IN NEWS GANGSTER NO 1 New 'El Chapo' seizes control of Mexico gang that sets rivals' heads on fire BUSTED Argentine MP caught kissing & fondling his girlfriend's boob during virtual debate HEIR FORCE ONE Meghan 'would consider running for President if she ditched Royal title' CREEPY CRAWLERS Dozens of horrifying 3ft-long robber crabs invade family's campsite BBQ FIT AND FIFTY 'World’s hottest gran' celebrates 50th as fans praise her youthful looks LASHED TO BITS Paedo collapses as he’s caned 52 times after being sentenced to 169 lashes

Jonah Falcon, 47, who claims to have a 13.5inch penis, says the fact that Roberto Esquivel Cabrera used weights means his claim is not real.

Jonah, 47, from New York, told The Sun Online: "His penis isn't 19inches.

"Doctors have acknowledged this and said he could have a normal sex life if he is essentially circumcised.

"It (Roberto's story) has been going around for the past two-and-a-half years.

Jonah Falcon explains how his penis is longer than his ARM on TLC show 'Well Hung: Living with the World's Largest Penis'

We pay for your stories! Do you have a story for The Sun Online news team? Email us at tips@the-sun.co.uk or call 0207 782 4368 . We pay for videos too. Click here to upload yours.