<正>Professor and Chairman,Department of Neurosurgery,Teikyo University School of Medicine,Tokyo,Japan Vice-Director of Teikyo University Hospital1983 M.D.,Faculty of Medicine,University of Tokyo1992 Ph.D.,Faculty of Medicine,University of Tokyo1995 Assistant Professor,Department of Neurosurgery,Teikyo University Ichihara Hospital1998 Associate Professor,Department of Neurosurgery,Teikyo University Ichihara Hospital2006 Professor and Chairman,Department of Neurosurgery,