1 Department of Radiology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, #108 Pyung-Dong, Jongno-Gu, Seoul, 03181, Republic of Korea.
2 Department of Radiology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, #108 Pyung-Dong, Jongno-Gu, Seoul, 03181, Republic of Korea. parkhiji@gmail.com.
3 Department of Neurosurgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
4 Department of Radiology, Korea University Anam Hospital, Seoul, Republic of Korea.