Anti-NMDA receptor encephalitis: two paediatric cases Introduction. Encephalitis associated to anti-N-methyl D-aspartate (NMDA) receptor antibodies is an autoimmune neurological pathology that has been reported increasingly more frequently in the paediatric population in recent years. We report two cases from our own experience with similar clinical pictures. Case reports. Case 1: a 5-year-old girl who began with clinical signs and symptoms of convulsions and altered consciousness, associated to movement disorders and regression of previously acquired abilities that developed into autism. Case 2: a 13-year-old girl who presented left-side hemiparesis, abnormal movements, conduct disorder and dysautonomia. In both cases positive anti-NMDA receptor antibodies were obtained in cerebrospinal fluid and they were diagnosed with anti-NMDA receptor encephalitis. In the first case, treatment was established with intravenous perfusion of corticoids and immunoglobulins, and rituximab also had to be associated. In the second case, treatment consisted in corticoids and immunoglobulins. Progress was favourable in both cases, with a slight language disorder as a sequela in the first case and a relapse in the second case, with full resolution. Conclusions. Anti-NMDA receptor encephalitis is a treatable disorder and early diagnosis and treatment are crucial, since this improves the prognosis and diminishes the chances of relapses.

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