title: Nonvasculitic autoimmune inflammatory meningoencephalitis.
abstract: Caselli and colleagues described five cases with encephalopathy, progressive cognitive decline, ataxia, abnormal CSF studies and steroid responsiveness, and proposed the term non-vasculitic autoimmune inflammatory meningoencephalitis (NAIM). Many of these cases had brain biopsy showing mild leptomeningeal perivascular lymphocytic inflammation, however, none of the cases had a post-mortem. Nonvasculitic autoimmune mediated meningoencephalitis has been described in patients with Sjogren's syndrome, systemic lupus erythematosus and, more recently, with Hashimoto's disease. The present study is the first post-mortem report of a case with a clinical diagnosis of NAIM. Neuropathological examination revealed a panencephalitis with intact vessel walls. T and B immunostaining showed a mixture of T and B cells. The findings were not consistent with other reported findings in collagen vascular diseases including Sjogren's syndrome, CNS vasculitis or Hashimoto's encephalopathy. There was no evidence of neoplasia, bacteria, acid-fast bacilli, fungi or atypical infectious agents. This is the first post-mortem report of a case with a clinical diagnosis of NAIM and demonstrates a panencephalitis without evidence of a vasculitis. The pathology seems unique, however, Sjogren and Hashimoto's encephalopathy might be variants of NAIM.
authors.affiliation: Department of Neurology, Mayo Clinic, Jacksonville, Florida 32224, USA.
authors.forename: Keith A
authors.initials: KA
authors.lastname: Josephs
authors.forename: Frank A
authors.initials: FA
authors.lastname: Rubino
authors.forename: Dennis W
authors.initials: DW
authors.lastname: Dickson
mesh_terms: D000368:Aged; D001327:Autoimmune Diseases / Q000473:pathology*; D001344:Autopsy; D001921:Brain / Q000098:blood supply / Q000473:pathology*; D003937:Diagnosis, Differential; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D007249:Inflammation / Q000473:pathology*; D008590:Meningoencephalitis / Q000473:pathology*