D Ito1, C Ishikawa1, N D Jeffery2, A Oshima1, T Nakayama3, M Kitagawa1. 1. Laboratory of Veterinary Neurology, School of Veterinary Medicine, Nihon University, Fujisawa, Kanagawa, 252-0880, Japan. 2. Department of Small Animal Clinical Sciences, Texas A&M University, College Station, TX, 77843, USA. 3. Laboratory of Veterinary Radiology, School of Veterinary Medicine, Nihon University, Fujisawa, Kanagawa, 252-0880, Japan.