By Elise McGrath & Rom Preston-Ellis A mum who mistook a whirring sound in her right ear for tinnitus was diagnosed with a brain tumour. Denise Wingfield, 55, struggled to sleep because of the dull, “funny” noise and was referred to an ear, nose and throat specialist and was told she had tinnitus. But following an MRI, doctors found an anomaly on her brain. A month later Denise underwent a nine hour awake craniotomy – and was diagnosed with grade 2 oligodendroglioma – a rare brain tumour. She had a further surgery following complications from the craniotomy. The mum-of-three had six weeks of r…