作者单位:Department of Radiology, Mayo Clinic, 200 First St SW, Rochester, MN 55905, United States[1]Department of Neurology, University of California, Los Angeles, CA, United States[2]Department of Neurology, Mayo Clinic, Rochester, MN, United States[3]Department of Radiology, Gangnam Severance Hospital, Yonsei University, Seoul, South Korea[4]