Jonathan Bedford1, Pooja Dassan2, Miranda Harvie3, Sanjeev Mehta4. 1. Department of Medicine, Ealing Hospital, Middlesex UB1 3HW, UK jpbedford@doctors.org.uk. 2. Department of Neurology, Ealing Hospital. 3. Department of Radiology, Ealing Hospital. 4. Department of Medicine, Ealing Hospital, Middlesex UB1 3HW, UK.