1. Department of Human Pathology; Gunma University Graduate School of Medicine; Maebashi Japan
2. Department of Pathology; Gunma University Hospital; Maebashi Japan
3. Department of Neurosurgery; National Hospital Organization Takasaki General Medical Center; Takasaki Japan
4. Department of Pathology; National Hospital Organization Takasaki General Medical Center; Takasaki Japan
5. Department of Radiology; Graduate School of Medicine; University of Tokyo; Tokyo Japan
6. Department of Neurosurgery; Koshigaya Hospital; Dokkyo University School of Medicine; Koshigaya Japan
7. Department of Pathology; Hidaka Hospital; Takasaki Japan