A young girl with an extremely rare blood disorder has been dealt a huge blow after her bone marrow donor her only match in the world pulled out at the last moment.

After developing a pinprick rash on her back, eight-year-old Evie Hodgson from Yorkshire in the UK was diagnosed with deadly aplastic anaemia in May, a blood disease in which the body doesnt produce enough blood cells.

The schoolgirl was due to undergo a bone-marrow transplant this month that would save her life but her donor called as she was preparing for the operation.

Evies parents Andy and Tina, and younger brother William, were sadly not a match, but they did find a 10/10 match, with the anonymous donor agreeing to the transplant.

But as she prepared for the transplant by having one of her ovaries removed and undergoing dental work, on August 14, just days before the planned surgery, the donor pulled out.

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Now her parents have set up a Facebook page to help find a new hero, calling on people to get tested and see if they are a match.

Initially it seemed that Evie had been lucky as a match for the transplant was found quickly and the procedure was planned to take place in August, a post on the Evie Needs a Hero Facebook page reads.

Only a few weeks prior to the planned transplant date Evies one and only 10/10 donor has pulled out of donating his stem cells. This news was totally unexpected and her family and friends are devastated.

In just over a week, the page has amassed almost 20,000 followers, many who are undergoing testing to see if they can help Evie.

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Mum Tina said the family were devastated by the huge blow adding they had no idea why the donor changed their mind everything is confidential.

Evie has already been through so much, she told The Metro. She thought she had a donor and now she doesnt.

The donor pulling out is quite hard-hitting but from our point of view we just want to raise awareness of the stem cell register.

Initially doctors thought Evie may have leukaemia when she became sick during coronavirus lockdown earlier this year.

Then they were given the devastating diagnosis of aplastic anaemia.

Evie needs a stem cell transplant from a compatible donor to survive and has recently undergone an immunosuppressant course of treatment while the search for a new stem cell donor continues.

I need this transplant to save my life, Evie says in a video on the Facebook page. Please sign the register to help save my life.

Continue the conversation @RebekahScanlan | rebekah.scanlan@news.com.au

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Girls heartbreaking plea after her only bone marrow donor pulls out - NEWS.com.au