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Surfers In The US Are Developing Abnormal Growths On Their Bellies Called "Liposurfomas"

The doctors call them "liposurfomas" and advise other clinicians to be on the look out for them.

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TOM HALE

Tom has a Master's degree in Journalism. His editorial work covers anything from archaeology and the environment to technology and culture.

Senior Journalist

Tom has a Master's degree in Journalism. His editorial work covers anything from archaeology and the environment to technology and culture.View full profile

Tom has a Master's degree in Journalism. His editorial work covers anything from archaeology and the environment to technology and culture.

View full profile
EditedbyTom Leslie
Tom Leslie headshot

TOM LESLIE

Editor & Staff Writer

Tom has a master’s degree in biochemistry from the University of Oxford and his interests range from immunology and microscopy to the philosophy of science.

Woman during surfing with morning light. Surf girl on surfboard.

Surf's up! Try to go easy on the prone paddling, if the waves let you.

Image credit: Wonderful Nature/Shutterstock.com


Doctors have noticed that die-hard surfers can sometimes develop fatty, fibrous growths on their upper bellies. In a medical case study, a team of experts in the US has documented the diagnosis and treatment of the unusual bumps, which they call “liposurfomas.” 

Liposurfomas and surfer belly

A team from the UC Irvine and Albany Medical College reported seven cases, all male and avid surfers in their 40s and 50s, who had developed a fatty bulge on their abdomen.

The paper, first published in 2024, explained that the condition was the result of “repetitive contact with the surfboard while prone paddling.”

In other words, they developed the growth from hours upon hours of lying chest-down on their boards, waiting to catch a wave. Over time, repeated microtrauma is thought to trigger the body’s self-repair mechanism, leading to inflammation and the proliferation of fat cells in the affected area. 

“These masses gradually increase in size with increased surfing activity and slowly diminish in size with prolonged surfing inactivity,” the paper added. 

A 44-year-old man surfer presented with "remarkably prominent" grows on his chest (Images A and B). The patient's chet 12 months after second liposuction procedure (Image C).
Liposurfomas: A 44-year-old man surfer presented with "remarkably prominent" growths on his chest (Images A and B). The patient's chest 12 months after the second liposuction procedure (Image C).
Image credit: P A Klein et al./JAAD Case Reports/2024 (CC BY-NC-ND 4.0)

How to fix liposurfomas 

Five of the surfers underwent surgery to remove the growth, but two of them declined the operation after being told they’d have to give up surfing – that’s dedication, you could say. Besides, the researchers believe that the growths are benign, so the need for removal is largely cosmetic. 

That said, they did add that the risk of these tumors turning nasty and malignant is currently unknown since so few cases have been reported. 

Three of the patients had the growth treated with surgery and a good-old-fashioned scalpel, which removed a pinky-orange mass, typical of fat deposits, and surrounded by a thin casing of collagen. The remaining two underwent liposuction to suck out the fatty tissues.

After catching up with the patients months after the treatment, all appeared to be a success. One of the liposuction cases had lesions partially regrow after 12 months because he kept surfing, but a second round of treatment gave a satisfactory result.

Liposurfomas on a 55-year-old male surfer (Image A), the fibrofatty mass after being removed (B), and photomicrographs of the tissue (C and D).
Liposurfomas on a 55-year-old male surfer (Image A), the fibrofatty mass after being removed (B), and photomicrographs of the tissue (C and D).
Image credit: P A Klein et al./JAAD Case Reports/2024 (CC BY-NC-ND 4.0)

The doctors were clear that liposurfomas are very different from so-called surfer's knots, which are the hard, callus-like masses that can grow on the knees, feet, and toes of longboard surfers who paddle while kneeling. 

In contrast, liposurfomas are fatty, soft, and found on the chest, and they primarily affect shortboard surfers who often paddle in the prone position. 

The benefits of surfing

Surfing comes with all kinds of risks – from physical injuries and surfer’s ear to the ever-present threat of antibiotic-resistant bacteria – but also holds many potential benefits. 

Studies have found a link between surfing and better mental wellbeing, while others have highlighted its positive benefits for physical health. 

That’s especially true for lifelong surfers as they approach older age. One piece of research from 2009 found that surfing over many years may help the body adapt in ways that keep the nerves and muscles working smoothly, which can ultimately lead to improved quality of life as people age.

The new study was published in JAAD Case Reports in June 2024.


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