C Leiva-Salinas1, S Mukherjee2. 1. Department of radiology, neuroradiology division, university of Virginia, 1215, Lee street, New Hospital, Charlottesville, VA, 22908, USA. 2. Department of radiology, neuroradiology division, university of Virginia, 1215, Lee street, New Hospital, Charlottesville, VA, 22908, USA. Electronic address: sm5qd@virginia.edu.