1. Department of Radiology, Inje University Haeundae Paik Hospital, Busan 612-030, Korea.
2. Department of Radiology, Inje University Busan Paik Hospital, Busan 633-165, Korea.
3. Department of Radiology, Busan National University Hospital, Busan 602-739, Korea.
4. Department of Pathology, Inje University Haeundae Paik Hospital, Busan 612-030, Korea.
5. Department of Neurosurgery, Inje University Haeundae Paik Hospital, Busan 612-030, Korea.