Mario Ganau1, Giacomo Talenti2, Felice D'Arco2. 1. From the Department of Neurosurgery (M.G.), Oxford University Hospitals, UK; Department of Diagnostics and Pathology (G.T.), Verona University Hospital, Italy; and Department of Neuroradiology (F.D.), Great Ormond Street Hospital For Children, London, UK. mario.ganau@alumni.harvard.edu. 2. From the Department of Neurosurgery (M.G.), Oxford University Hospitals, UK; Department of Diagnostics and Pathology (G.T.), Verona University Hospital, Italy; and Department of Neuroradiology (F.D.), Great Ormond Street Hospital For Children, London, UK.