Anti-N-methyl-D-aspartate (NMDA) receptor encephalitis is an immune-mediated disease commonly associated with ovarian teratoma. Anti-NMDA-receptor autoantibodies disrupt NMDA function leading to the development of psychosis, seizures and autonomic dysfunction. The treatment includes underlying tumour resection and immunosuppression. Slow recovery and unpredictable clinical course makes intensive care management of these patients challenging. We report the management of two young female patients with anti-NMDA-receptor encephalitis associated with ovarian teratoma.