PMID- 21611826 OWN - NLM STAT- MEDLINE DCOM- 20120522 LR - 20211020 IS - 1432-1998 (Electronic) IS - 0301-0449 (Linking) VI - 42 IP - 1 DP - 2012 Jan TI - 'Benign' ovarian teratoma and N-methyl-D-aspartate receptor (NMDAR) encephalitis in a child. PG - 120-3 LID - 10.1007/s00247-011-2111-6 [doi] AB - N-methyl-D-aspartate receptor (NMDAR) encephalitis is a life-threatening paraneoplastic neuropsychiatric encephalitis that predominantly affects young women and has a strong association with ovarian teratomas. Removal of the ovarian teratomas improves the prognosis and decreases the risk of recurrence. We present an 11-year-old girl with NMDAR encephalitis with small bilateral teratomas not initially appreciated on abdominal CT or pelvic MRI. A 12-mm teratoma was identified in the right ovary and a 7-mm teratoma was identified in the left ovary on US follow-up at 5 months. Intraoperative sonography was used to localize the teratomas for excision. In NMDAR encephalitis, the ovarian teratomas can be very small, particularly in children, and easily missed on cross-sectional imaging. Awareness of the association of NMDAR encephalitis and ovarian teratomas will improve the diagnostic accuracy and imaging interpretation. Periodic sonography and MRI might be warranted in children if the initial study is negative. FAU - Frawley, Kieran J AU - Frawley KJ AD - Department of Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA. kieran_frawley@health.qld.gov.au FAU - Calvo-Garcia, Maria A AU - Calvo-Garcia MA FAU - Krueger, Darcy A AU - Krueger DA FAU - McMasters, Richard L AU - McMasters RL LA - eng PT - Case Reports PT - Journal Article DEP - 20110525 PL - Germany TA - Pediatr Radiol JT - Pediatric radiology JID - 0365332 SB - IM MH - Anti-N-Methyl-D-Aspartate Receptor Encephalitis/*complications/*diagnosis MH - Child MH - Female MH - Humans MH - Magnetic Resonance Imaging MH - Ovarian Neoplasms/complications/*diagnosis/*surgery MH - Teratoma/complications/*diagnosis/*surgery MH - Tomography, X-Ray Computed MH - Treatment Outcome EDAT- 2011/05/26 06:00 MHDA- 2012/05/23 06:00 CRDT- 2011/05/26 06:00 PHST- 2011/01/10 00:00 [received] PHST- 2011/03/25 00:00 [accepted] PHST- 2011/03/21 00:00 [revised] PHST- 2011/05/26 06:00 [entrez] PHST- 2011/05/26 06:00 [pubmed] PHST- 2012/05/23 06:00 [medline] AID - 10.1007/s00247-011-2111-6 [doi] PST - ppublish SO - Pediatr Radiol. 2012 Jan;42(1):120-3. doi: 10.1007/s00247-011-2111-6. Epub 2011 May 25.