Pediatric anti-N-methyl-D-aspartate receptor encephalitis-clinical analysis and novel findings in a series of 20 patients
Thaís Armangue, Maarten J Titulaer, Ignacio Málaga, Luis Bataller, Iñigo Gabilondo, Francesc Graus, Josep Dalmau, Spanish Anti-N-methyl-D-Aspartate Receptor (NMDAR) Encephalitis Work Group, Maite Carreras-Rodríguez, Jordi Espinosa-Garcia, Alfonso Falcón, Jaime Gállego Pérez-Larraya, Verónica Garcia-Sanchez, Enriqueta Gómez, Verónica González-Álvarez, Juan Carlos Gómez-Esteban, Rocío Jadraque, África Jiménez-Vidal, Francisco López-Pisón, Alfons Macaya, Emilio Monteagudo, Guillermo Navarro-Mascarell, Ernest Palomeras-Soler, Anna Pellisé-Guinjoan, Rogelio Simòn De Las Heras, Eulália Turón-Viñas, Alvaro Vela, Mireia Del Toro, Thaís Armangue, Maarten J Titulaer, Ignacio Málaga, Luis Bataller, Iñigo Gabilondo, Francesc Graus, Josep Dalmau, Spanish Anti-N-methyl-D-Aspartate Receptor (NMDAR) Encephalitis Work Group, Maite Carreras-Rodríguez, Jordi Espinosa-Garcia, Alfonso Falcón, Jaime Gállego Pérez-Larraya, Verónica Garcia-Sanchez, Enriqueta Gómez, Verónica González-Álvarez, Juan Carlos Gómez-Esteban, Rocío Jadraque, África Jiménez-Vidal, Francisco López-Pisón, Alfons Macaya, Emilio Monteagudo, Guillermo Navarro-Mascarell, Ernest Palomeras-Soler, Anna Pellisé-Guinjoan, Rogelio Simòn De Las Heras, Eulália Turón-Viñas, Alvaro Vela, Mireia Del Toro
Abstract
Objective: To report the clinical features of 20 pediatric patients with anti-N-methyl-D-aspartate receptor (NMDAR) encephalitis.
Study design: Review of clinical data, long-term follow-up, and immunologic studies performed in a single center in Spain in the last 4 years.
Results: The median age of the patients was 13 years (range, 8 months-18 years), 70% were female. In 12 patients (60%), the initial symptoms were neurologic, usually dyskinesias or seizures, and in the other 40% psychiatric. One month into the disease, all patients had involuntary movements and alterations of behavior and speech. All patients received steroids, intravenous immunoglobulin or plasma exchange, and 7 rituximab or cyclophosphamide. With a median follow up of 17.5 months, 85% had substantial recovery, 10% moderate or severe deficits, and 1 died. Three patients had previous episodes compatible with anti-NMDAR encephalitis, 2 of them with additional relapses after the diagnosis of the disorder. Ovarian teratoma was identified in 2 patients, 1 at onset of encephalitis and the other 1 year later. Two novel observations (1 patient each) include, the identification of an electroencephalographic pattern ("extreme delta brush") considered characteristic of this disorder, and the development of anti-NMDAR encephalitis as post herpes simplex encephalitis choreoathetosis.
Conclusions: The initial symptoms of pediatric anti-NMDAR encephalitis vary from those of the adults (more neurologic and less psychiatric in children), the development of a mono-symptomatic illness is extremely rare (except in relapses), and most patients respond to treatment. Our study suggests a link between post herpes simplex encephalitis choreoathetosis and anti-NMDAR encephalitis.
Conflict of interest statement
The authors declare no conflicts of interest.
Copyright © 2013 Mosby, Inc. All rights reserved.
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Source: PubMed