A patient in a critical condition is rushed to the centre after collapsing at the wheel while driving. He's had a stroke and the on-call trauma team have no time to lose. His brain is swelling, and his chances of survival are looking slim. After suffering from headaches and dizzy spells, scans showed that 30-year-old Ashley had a life threatening tumour on his brain. First job is to remove the tumour, the second to analyse it for cancer.Sixty-five-year-old Beverley has been living with chronic lower back pain for years, to alleviate this she's having a metal spacer cage inserted between two vertebrae but, just millimetres from the spinal cord, there's no room for error.