PMID- 32134592 OWN - NLM STAT- MEDLINE DCOM- 20200804 LR - 20200804 IS - 2791-6421 (Electronic) IS - 0041-4301 (Linking) VI - 61 IP - 6 DP - 2019 TI - Rapid onset of altered mental status with progressive autonomic instability and hypoventilation in a 2-year-old male. PG - 949-952 LID - 2086 [pii] LID - 10.24953/turkjped.2019.06.019 [doi] AB - Nazari R, Carmona Jr CA. Rapid onset of altered mental status with progressive autonomic instability and hypoventilation in a 2-year-old male. Turk J Pediatr 2019; 61: 949-952. Anti N-methyl-D-aspartate receptor (NMDAR) encephalitis should be suspected in children who report with acute behavioral change, seizures, and non-specific movement disorders. While historically associated with adolescent females with ovarian teratoma, anti-NMDAR encephalitis has now been described in the pediatric population of both sexes. These patients display the neurological and psychiatric manifestations similar to females but lack a tumor. We report a two-year-old previously healthy young male who presented with alteration in speech, seizures, and extra pyramidal movement disorders. He was diagnosed with anti-NMDAR encephalitis with positive cerebrospinal fluid (CSF) serology for anti-NMDAR antibodies. In this case report, we describe the clinical presentation, course of illness, investigation, and management of our patient. We conclude by emphasizing three observations and insights from our case compared to what is mentioned in the literature. FAU - Nazari, Ramin AU - Nazari R AD - Department Pediatric Critical Care, Florida Hospital for Children, University of Central Florida College of Medicine, Orlando, Florida-USA. FAU - Carmona-Jr, Carlos A AU - Carmona-Jr CA AD - Department of Pediatrics, Florida Hospital for Children, University of Central Florida College of Medicine, Orlando, Florida-USA. LA - eng PT - Case Reports PL - Turkey TA - Turk J Pediatr JT - The Turkish journal of pediatrics JID - 0417505 RN - 0 (Biomarkers) RN - 0 (GRIN1 protein, human) RN - 0 (Nerve Tissue Proteins) RN - 0 (Receptors, N-Methyl-D-Aspartate) SB - IM MH - Anti-N-Methyl-D-Aspartate Receptor Encephalitis/*complications/diagnosis MH - Biomarkers/cerebrospinal fluid MH - Cerebrospinal Fluid/metabolism MH - Child, Preschool MH - Humans MH - Hypoventilation/*etiology/physiopathology/surgery MH - Male MH - *Mental Health MH - Nerve Tissue Proteins/cerebrospinal fluid/immunology MH - Receptors, N-Methyl-D-Aspartate/immunology MH - Tracheostomy OTO - NOTNLM OT - CSF serology OT - NMDA receptors OT - movement disorders OT - pediatric neurology OT - tumor EDAT- 2019/01/01 00:00 MHDA- 2020/08/05 06:00 CRDT- 2020/03/06 06:00 PHST- 2020/03/06 06:00 [entrez] PHST- 2019/01/01 00:00 [pubmed] PHST- 2020/08/05 06:00 [medline] AID - 2086 [pii] AID - 10.24953/turkjped.2019.06.019 [doi] PST - ppublish SO - Turk J Pediatr. 2019;61(6):949-952. doi: 10.24953/turkjped.2019.06.019.