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Need To Know > Fitness and health > ‘I collapsed minutes after Ironman challenge – doctors found huge tumour size of newborn inside my belly’
Triathlete collapses at Ironman UK, discovers 11 lb tumor. After life-saving surgery, she returns to racing, inspiring others with her resilience and determination.
Fitness and health

‘I collapsed minutes after Ironman challenge – doctors found huge tumour size of newborn inside my belly’

Amy Walters
Last updated: August 8, 2024 9:10 am
Amy Walters Published August 8, 2024
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Samantha Boswell with a medicine ball that weighed the same as her tumour. (Picture: Jam Press)
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A woman who collapsed following a triathlon has revealed her ordeal after finding out it was due to a tumour larger than a newborn.

Samantha Boswell was near the peak of her athletic career, having already become an award-winning triathlete.

But then, her entire world turned upside down.

READ MORE: Baby born with super rare condition that only 400 people in world have after ‘normal’ pregnancy

During a gruelling Ironman UK challenge, the 53-year-old felt a sharp and sudden pain in her abdomen, with this quickly becoming “excruciating” – and she collapsed moments after passing the finish line.

Following the event, she noticed a bulge in her belly, which after various scans, was confirmed to be retroperitoneal sarcoma – a cancerous tumour weighing a whopping 11 lbs – larger than the average newborn.

Triathlete collapses at Ironman UK, discovers 11 lb tumor. After life-saving surgery, she returns to racing, inspiring others with her resilience and determination.
Samantha Boswell in the hospital grounds during her rehabilitation. (Picture: Jam Press)

“Initially, I was numb and in disbelief,” the sports masseuse, from Bromsgrove, told NeedToKnow.

“I feared for my life and I honestly thought my sporting days were over if I did survive this.

“And then the thought hit me immediately – how do I tell my son?

“[I was scared] about not being around for him and there to watch him grow up.

“I felt like I was letting him and my husband down.

“I found [the size] hard to take in, but my surgeon was very positive from the start that he could save me.

“I went from constantly trying to be positive to just being terrified.”

Samantha, who initially suffered with backache and IBS symptoms, thought the bulge was simply down to her age and other symptoms due to her active lifestyle.

Triathlete collapses at Ironman UK, discovers 11 lb tumor. After life-saving surgery, she returns to racing, inspiring others with her resilience and determination.
Samantha Boswell’s scar following the removal of her tumour. (Picture: Jam Press)

But after her aforementioned diagnosis in August 2022, emergency surgery was carried out to remove the tumour entirely.

Due to the size, she also had to lose a kidney, adrenal gland, part of her bowel and part of her abdominal wall, as well as some of her aorta and psoas muscle.

While spending the next two months recovering in hospital, Samantha was determined not to give up.

She said: “In hospital, when I started to walk to the toilet and back, I would time myself.

“I’d clock the distance on my fitness watch and add a little further each day.

“It was a triumph to walk a quarter mile down the hospital corridors.

“It took me a year to be able to walk properly again – but after that, nothing could stop me.

“I [began with] sitting on a static bike for 20 minutes to spin my legs and from there, I gradually built up my fitness.”

This year, she started racing again and has since completed a triathlon for Sarcoma UK, a charity working with those suffering from the disease, in which she took woman’s first place.

Triathlete collapses at Ironman UK, discovers 11 lb tumor. After life-saving surgery, she returns to racing, inspiring others with her resilience and determination.
Samantha Boswell training in Majorca in 2024. (Picture: Jam Press)

Now, she’s training for the next race and has also penned a book called: Ironman, Me and The Big C, to share her journey and inspire aspiring triathletes, as well as giving hope to anyone facing a similar diagnosis.

Samantha added: “I really love what I do.

“I love running and competing and being in the fresh air – it’s my medicine.

“I have always wanted to improve myself and do the best I can.

“I want to decide on my own terms when to stop competing – not have the decision made for me by cancer.

“My attitude was that if I can’t run, then I’ll swim and bike instead.

“I have to pinch myself when I look back at what I have been through.

“I didn’t think I’d ever race again.

“Do not make excuses for things in your health that aren’t quite right – and be grateful for everyday and the simple things in life.

“I still have a long way to go to achieve my dreams and return to where I was.

“But I’m loving racing again – even more than before I was diagnosed – and I look at it as a true blessing.

“The dream is for sarcoma to never come back and for me to watch my boy grow into a man, while sharing life with my husband.”

Triathlete collapses at Ironman UK, discovers 11 lb tumor. After life-saving surgery, she returns to racing, inspiring others with her resilience and determination.
Samantha Boswell at her first triathlon after the operation, taking first place for Sarcoma UK. (Picture: Jam Press)

Kerry Reeves-Kneip, Director of Communications and Fundraising at Sarcoma UK, said: “Sam’s achievement is nothing short of awe-inspiring.

“Imagine facing the shock of a 5kg sarcoma diagnosis, followed by major surgery that included losing a kidney.

“Yet Sam didn’t just recover — she thrived, pushing herself to compete in one of the world’s most demanding sports.

“Her resilience and determination are truly remarkable.”

READ MORE: ‘I developed bizarre allergy from pizza – my face swelled so much I could barely see’

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