He must find $80,000 by Tuesday night to pay the surgeon up front

Instead he found a neurosurgeon who would do the operation

He was told by doctors it was too aggressive to operate on

The money is needed to fund his life-saving brain surgery

Teen with deadly brain tumour has almost raised $80,000

A teenager with a deadly brain tumour has raised the majority of $80,000 needed to fund his life-saving surgery.

With less than a day left to go before he is due to be operated on, 18-year-old Jackson Byrnes from Northern New South Wales has accumulated close to the target on hisGoFundMe page.

Three weeks ago Mr Byrnes was told by doctors that he had a stage four brain tumour that was too deep and aggressive to be safely operated on.

Jackson Byrnes (pictured) is less than a day away from accumulating enough money to pay for life-saving brain surgery

Refusing to accept the dismal diagnosis, his family took matters into their own hands and found the only Australian neurosurgeon to perform the risky operation.

After nine days of desperate campaigning through Facebook and the crowd funding page GoFundMe, the Casino teenager is just under $4,000 away from raising enough money to save his life.

Taking to his Facebook fundraising page - Jackson Byrnes Brain Tumor Surgery Fund - friends of Jackson thanked the thousands of people who have made donations to the page.

Jackson Byrnes was diagnosed with a stage four brain tumour three weeks ago

Jackson Byrnes is just under $4,000 away from achieving his $80,000 target

'Jackson we're not far from achieving the 80k) an admin person on the page wrote.

'We couldn't have done this without the support of you all' they said.

According to the Gold Coast Bulletin, Mr Byrnes' girlfriend, Jahnae Jackson, noticed he had developed a limp a mere three weeks ago and prompted him to visit a doctor who requested an MRI.

He was rushed to the Gold Coast for a biopsy which found a stage four tumour buried deep in the teenager's brain.

Mr Byrnes was told they would not operate due to how deep the cancer was, but instead suggested chemotherapy and radiation treatment.

A teenager with a deadly brain tumour must raise $80,000 by Tuesday night in order to pay for his surgery

After a week of campaigning online, the Casino teenager is nearly there with less than a day to go

Knowing that this was not enough, Mr Byrnes and his family searched for a specialist who would perform the dangerous procedure.

They found neurosurgeon Charlie Teo who would operate on Wednesday as long as he received an upfront payment of $80,000 by Tuesday evening.

The family then turned to social media and crowd sourcing in a desperate plea for donations.

'Most boys his age begin their journey into adulthood with hopes , dreams and anticipation of what lies ahead and excitement of the endless opportunities of what life will bring them,' Mr Byrne's fundraising page on GoFundMe reads.

Messages of support and promotion of the cause have flooded social media for the Casino teenager

The donations have been coming in thick and fast since the GoFundMe page was created

'It is not a time to be enduring a fight for your life.'

In seven days, over $47,000 has been raised by 956 people and the link has been shared nearly 1000 times.

Victorian finance, leasing and risk management company Morris Finance have made the largest donation to the cause by pledging $2000.

'#savejackon has reached past the half way mark at $40,255 with two days to go,' a supporter posted on Twitter

In nine days over $76,000 was raised for the teen's surgery

Rooftech Australia, Summerland Credit Union and Alstonville Quality Meats have also donated generous sums for Mr Byrnes.

Messages of support have also flooded social media for the Casino teenager.

'Thoughts and prayers going out to you Jackson, stay strong,' wrote one well wisher on the fundraising page.

'Hoping for the best possible outcome for you! Hugs from our family to yours!' wrote another.

The Twitter hashtag #savejackson has also been circulating through the Casino and Lismore area.