Dagmar Turner, 53, a former management consultant from the Isle of Wight, played her violin during an operation to remove a tumour from the right frontal lobe of her brain - close to the area that controls the fine movement of her left hand.

To prevent any damage to her violin skills, Professor Keyoumars Ashkan, Consultant Neurosurgeon at King’s College Hospital, came up with a plan: they would map her brain, open the skull and then get her to play as they removed the tumour.

While surgeons cut away part of her brain, Turner played music by Gustav Mahler, George Gershwin’s jazz classic “Summertime” and pieces by Spanish songwriter and singer Julio Iglesias.