Doctors plan to use details of a boy's rare reaction to a head injury as a case study for medics across the country to follow.

Twelve-year-old Aaron Brennan suffered a haematoma - bleeding on the brain - when he fell off his bike.

But because he did not display the usual symptoms, it was not detected for seven weeks when his worried parents Graham and Susan insisted that he underwent a CT scan.

He was taken to Leeds General Infirmary where an operation was performed to relieve the pressure on his brain. Mr and Mrs Brennan, of Boston Walk, Wibsey, hope their ordeal will make other parents aware of the dangers of what was thought to be a head injury and which Bradford Royal Infirmary put down to a migraine and grief following the loss of his grandfather.

Their son, a pupil at Buttershaw High School, had become sick with headaches after he played in a football tournament on June 1 - the day after he had fallen off his bike. They took him to A&E at BRI where doctor carried out an examination and told them to give him paracetamol.

The following Thursday, the youngster, who plays football for Shelf Juniors, began to suffer from bad headaches. Even though it was late in the evening his parents decided to take him back to A&E.

"They said the same as last time but this time they gave us an appointment to see a head specialist on June 5," said Mrs Brennan, pictured with Aaron.

At the appointment Aaron was told he was fine. But in July the headaches were just as bad. He kept several appointments with the hospital, when doctors repeatedly told the family the cause of the problem was migraine and grief.

Eventually after seven weeks, to reassure the family, Aaron was offered a CT scan which revealed the serious injury. "I felt really angry," said Mrs Brennan. "We believe the doctors should have recognised what was wrong."

However, a spokesman for Bradford Hospitals NHS Trust stressed that all medical guidelines had been correctly followed.

He said: "Even for the highly skilled and experienced staff involved, this was an extremely unusual case. We feel that it was so unusual that we are planning to bring the case to the attention of the wider A&E community in the NHS.

"We regret that this internal injury was not pinpointed earlier. However, the patient did not show any of the worrying signs or symptoms associated with an extradural haematoma."