A 14-year-old girl presented with acute features of
fever, severe
headache, altered behavioral changes,
delirium, autonomic instability, episodes of seizure, and
involuntary movement over a period of 1 month. Upon investigation, electroencephalogram (EEG), computed tomography (CT), and magnetic resonance imaging (MRI) of her brain showed normal findings. Her serum and cerebrospinal fluid were positive for anti-NMDARs, and a diagnosis of
anti-NMDAR encephalitis was made, so she received a course of intravenous methyl
prednisolone and
immunoglobulin and was discharged after her neurological status improved. Upon further workup, she was suspected to have a left ovarian
dermoid cyst on transabdominal ultrasonogram, which was an incidental finding. Her
tumor marker panel showed normal serum
lactate dehydrogenase, beta
human chorionic gonadotropin,
inhibin,
alpha-fetoprotein, and
carcinoembryonic antigen and a
cancer antigen 125 level of 71.5 U/L. She eventually underwent laparoscopic left ovarian
cystectomy and received
immunotherapy in the postoperative period. She was discharged in stable condition on postoperative day 4. On histopathological examination, the specimen revealed a mature cystic
teratoma with glial component. One year after surgery, the patient has recovered completely and has no residual psychiatric or neurological symptoms.
CONCLUSION: