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  • Title: [N-methyl-D-aspartate receptor antibody encephalitis: value of immunomodulatory therapy].
    Author: Le Moigno L, Ternant D, Paintaud G, Thibault G, Cloarec S, Tardieu M, Lagrue E, Castelnau P.
    Journal: Arch Pediatr; 2014 Jun; 21(6):620-3. PubMed ID: 24832126.
    Abstract:
    INTRODUCTION: Anti-N-methyl-D-aspartate receptor (NMDA-R) encephalitis is little known to pediatricians and likely underdiagnosed. The child's vital and cognitive prognosis is at stake. The use of immunomodulatory drugs, such as rituximab has led to spectacular results, but many questions remain about its mode of action in this type of pathology. CASE REPORT: We report the case of a 6-year-old girl with no medical history, admitted for status epilepticus preceded by behavior symptoms and sleep disorders. Gradually, the child became bedridden, mute, and animated by predominantly orofacial dyskinesia. Examinations were normal (cerebrospinal fluid [CSF] analysis, brain MRI). The diagnosis was established by the presence of NMDA-R antibodies in the CSF. After exclusion of a tumor-associated syndrome, treatment was started initially by intravenous immunoglobulins, then by plasma exchange, and finally rituximab. The patient was cured with rituximab despite an unusually early recovery of the B-cell pool. DISCUSSION: Anti-N-methyl-D-aspartate receptor (NMDA-R) encephalitis is a severe but potentially reversible neurologic disorder only recently described, even in childhood. It may be reversible without sequelae if diagnosed and treated early. The use of immunomodulatory therapy, such as rituximab seemingly improves the outcome. Immunological monitoring is needed to better understand its mechanism of action in autoimmune diseases of the nervous system in childhood.
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