Successful outcome following detection and removal of a very small ovarian teratoma associated with anti-NMDA receptor encephalitis during pregnancy.

Anti–N‐methyl‐d‐aspartate (NMDA) receptor encephalitis was identified in 2007 by Dalmau and colleagues 1. It is caused by an autoimmune reaction against the NMDA receptor, which is characterized by psychiatric and neurologic symptoms mimicking herpetic encephalitis. The onset of anti‐NMDA receptor encephalitis in females is associated with ovarian teratomas 1, 2. Herein we report a case of anti‐NMDA receptor encephalitis without neurological sequelae after prompt detection and treatment of a small ovarian teratoma in a pregnant woman at 16 weeks of gestation.