[1] Ehime Prefectural Cent Hosp, Dept Neurol, Matsuyama, Ehime, Japan
[2] Ehime Prefectural Cent Hosp, Dept Neurosurg, Matsuyama, Ehime, Japan
[3] Ehime Prefectural Cent Hosp, Dept Pathol, Matsuyama, Ehime, Japan
[4] Kyushu Univ, Grad Sch Med Sci, Dept Neuropathol, Fukuoka, Fukuoka, Japan