1. Department of Radiology and Center of Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135- 710, Korea.
2. Department of Radiology and Center of Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea.
3. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea.
4. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea.