1. From the Department of Neurosurgery and Interventional Neuroradiology (T.M., K.S., M.H., Y.H., T.M.), Hiroshima City Asa Citizens Hospital, Japan
2. Department of Neurosurgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Japan (T.M., K.S., D.I., S.S., K.K.).
3. Department of Pathology (M.K.), Hiroshima City Asa Citizens Hospital, Japan
4. Department of Radiology (C.O.), Hiroshima City Asa Citizens Hospital, Japan