1. Department of Radiology, The Catholic University of Korea, College of Medicine, Gyeonggi-do 480-130, Korea.
2. Department of Pathology, The Catholic University of Korea, College of Medicine, Gyeonggi-do 480-130, Korea.
3. Department of Neurosurgery, The Catholic University of Korea, College of Medicine, Gyeonggi-do 480-130, Korea.