1. Department of Neurology, Kurashiki Heisei Hospital, Kurashiki 710-0826, Japan
2. Neuroradiology Center, Kurashiki Heisei Hospital, Kurashiki 710-0826, Japan
3. Division of Radiology, Department of Multidisciplinary Internal Medicine, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan