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Figure 1. (A) Normal cranial MRI scan; (B) FDG-PET scan showed hypo-metabolism in the right temporal and bilateral occipital lobes; (C and D) pelvic computed tomography and MRI revealed a cystic lesion; (E and F) ovarian teratoma was resected during laparoscopy. The tumor consisted of bone, teeth and hair; (G) positive HEK 293 cells with anti-NMDAR antibodies using patient's cerebrospinal fluid (white arrows indicate the positive cells); (H) positive immunostaining of teratoma using NMDA NR1 receptor antibody (scale bar = 100 μm, black asterisks indicate the NR1 positive cells). The negative control of NMDAR immunostaining in HEK 293 cells (I) and in teratoma tissue (J). MRI: magnetic resonance imaging; NMDAR: N-methyl-d-aspartate-receptor; HEK: human embryonic kidney; FDG: fluorodeoxyglucose; PET: positron emission tomography