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Department of Radiology and Department of Neurosurgery, Kyunghee East-West Neo Medical Center, Kyunghee University, College of Medicine, Seoul, Korea; Department of Radiology, Kyunghee University Medical Center, Kyunghee University, College of Medicine, Seoul, Korea Received September 25, 2009; accepted after revision January 13, 2010. Correspondence to: Chang-Woo Ryu, MD, Department of Radiology, East-West Neo Medical Center, School of Medicine, Kyunghee University, 149 Sangil-dong, Gangdong-gu, Seoul 137-727, Korea. Tel. 82-2-440-6186 Fax. 82-2-440-6932 E-mail: md.cwryu@gmail.
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Ryu et al. (2010) studied this question.
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