Seven doctors failed to diagnose an eight-year-old boy's cancer - despite him having a fist-sized tumour behind his nose and lumps on his neck.
Freddie Dixon was eventually given the devastating news that he has non-Hodgkins Lymphoma.
His mum Lauren Chambers and dad Adam Dixon said their concerns has repeatedly dismissed and were told he had a viral infection.
Freddie was admitted to hospital when his condition worsened and the family were told "it was a life or death situation", Nottinghamshire Live reports.
Freddie received an MRI scan, and his mum said: "On top of the three visible lumps in his neck, [doctors] could see there was a tumour in his shoulder, pancreas, and one the size of his fist behind his nose, which was very close to his brain."
Due to the size of the tumours in Freddie's neck, he was having problems breathing and began to feel very unwell.
A biopsy confirmed the tumours were cancerous and the family was told that Freddie would need six cycles of intensive chemotherapy.
She added: "He's just sleeping all the time. He's not really talking, because his mouth is very sore. He can barely smile.
"We are just taking each day as it comes."
Miss Chambers noticed a large lump had appeared on Freddie's neck on Monday, May 6.
After taking him to their GP the following day, a doctor prescribed a week-long course of antibiotics, saying it was a virus.
But the week passed and another lump appeared and Freddie was taken to A&E at Kings Mill Hospital, but Miss Chambers said "no one was concerned."
She was advised to ask for a referral to see a pediatrician, but there were no appointments for 11 days and during that time, a third lump appeared.
Miss Chambers, 30, added: "The pediatrician gave Freddie a blood test, but by then he was really sick and his breathing changed. That's when the hospital finally did an MRI scan on May 31."
By this point, Freddie had been seen by seven different doctors, before being transferred to Queen's Medical Centre for a biopsy.
The lumps had become so large, doctors said they were crushing his airway, and it would be too dangerous to perform on him.
Freddie spent four days on steroids to reduce the size of the tumours before he could have the biopsy.
It was confirmed the tumours were cancerous and he was then moved to the children's oncology ward at QMC to begin treatment.
The family has been told Freddie will need six months of intensive chemotherapy but that he has a high 80 per cent chance of beating the cancer.
"Everyday is different, it's hard. We are trying to stay positive and be strong for Freddie," Miss Chambers said.
"He knows he has cancer, there are posters around the ward and other poorly children. He knows he will lose his hair.
"I'm just thinking about Freddie getting better, but I think as time goes on I will be more angry and will want to raise a complaint.
"I feel let down and it should have been investigated a lot sooner.
"We are just trying to stay hopeful that he can be out in time for his birthday and Christmas."
A spokesman for Sherwood Forest Hospitals said: “We would like to extend our sympathies to Freddie and his family, and wish him all the best with his ongoing treatment.
“It isn’t appropriate for us to discuss a patient’s individual care, but in general terms we follow clear evidence-based processes for the diagnosis of serious diseases such as cancer based on the information available to clinical staff at the time.
"As this is the first time that these concerns have been raised to us we would welcome the opportunity to discuss this in more detail with Freddie’s family if they wish to contact us directly through our Patient Experience Team."
A spokesman for NHS Mansfield and Ashfield Clinical Commissioning Group (CCG), said: "All feedback and complaints are treated seriously and confidentially."
