“…A population-based survey indicated that the prevalence of psychotic disorders in MS patients is approximately 1.5% [7]. In addition, little information Corresponding Author: Norio Yasui-Furukori, MD, PhD, Department of Neuropsychiatry, Hirosaki University, School of Medicine, Hirosaki 036-8562, Japan; Tel: +81-172-39-5066, Fax: +81-172-39-5067, E-mail: yasufuru@hirosaki-u.ac.jp exists regarding neuropsychiatric symptoms in NMOSD patients, although several reports have suggested that neuropsychiatric symptoms, such as paranoia [8], catatonia [9] and psychomotor agitation [10], occur in these patients. In particular, few reports on NMOSD have described a severe hallucinatory-paranoid state similar to that of schizophrenia.…”