N-Methyl-D-Aspartate Receptor Encephalitis, Post Herpes Encephalitis in Two Pediatric Cases.

Commonly, herpes simplex virus (HSV) causes infectious encephalitis among children. A neurological relapse after primary HSV encephalitis in the weeks or months after presentation is well recognized. Relapsing symptoms of post-HSV encephalitis can present either as a true relapse or an immune-mediated disorder. A relationship is predicted between immune-mediated disorder and N-methyl-D-aspartate receptor (NMDAR) antibodies. This study presents two cases of patients suffering from anti-NMDAR encephalitis that appeared after treatment for proven HSV encephalitis. The first patient was treated immediately after the presentation as autoimmune encephalitis and had an excellent outcome. The second patient had delayed initiation of treatment and suffered from intractable epilepsy and severe global developmental delay. An important role is played by recognizing anti-NMDAR encephalitis symptoms and its variable presentation for timely diagnosis and quick initiation of treatment for anti-NMDAR encephalitis, thus, improving the outcome for those patients.