1 Department of Radiology (MK, NS, YK, KM), National Center of Neurology and Psychiatry, Tokyo; Department of Cancer Pathology (ZT), Faculty of Medicine, Hokkaido University, Sapporo; Department of Neurosurgery (MI), Department of Child Neurology (MS), and Department of Pathology and Laboratory Medicine (YS), National Center of Neurology and Psychiatry, Tokyo, Japan.