1Department of Diagnostic Radiology, Yonsei University of College of Medicine, Seoul, Korea.
2Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
Address reprint requests to Dr. E. K. Kim, Department of Diagnostic Radiology, Yonsei University College of Medicine, C.P.O. Box 8044, Seoul 120-752, Korea. Tel: 82-2-361-5837, Fax: 82-2-393-3035, ekkim@yumc.yonsei.ac.kr