Barbara Young, BSc, Med Sci (Hons), PhD, MB, BChir, MRCP, FRCPA, Director of Anatomical Pathology, Hunter Area Pathology Service, John Hunter Hospital; Conjoint Associate Professor, University of Newcastle, Newcastle, New South Wales, Australia, Alan Stevens, MBBS, FRCPath, Senior Lecturer in Pathology, University of Nottingham Medical School and Honorary Consultant Pathologist, Queen's Medical Centre, University Hospital NHS Trust, Nottingham, UK, James S. Lowe, BMedSci, BMBS, DM, FRCPath, Professor of Neuropathology, University of Nottingham Medical School, Nottingham, UK, Phillip Woodford, MB BS, FRCPA, Senior Staff Specialist, Anatomical Pathology and Cytopathology, Hunter Area Pathology Service, John Hunter Hospital, New Castle, New South Wales, Australia and Geraldine O'Dowd, BSc (Hons), MBChB (Hons), FRCPath, Consultant Diagnostic Pathologist, Lanarkshire NHS Board, Honorary Clinical Senior Lecturer, University of Glasgow, Glasgow, Scotland