Autoimmune encephalitis (AIE) is considered one of the most common causes of acute noninfectious encephalitis. Autoimmune encephalitis is usually of acute or subacute onset and may become chronic later. Suggested mechanisms that may trigger AIE include tumor (paraneoplastic), infection (parainfection) or may be cryptogenic. Autoimmune encephalitis has a wide range of clinical manifestations including behavioral and psychiatric symptoms, autonomic disorders, movement disorders and seizures. In

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... is Case Report 13 year old boy, Hindu, Balinese, currently attending junior high school, unmarried, student. The patient was consulted to the psychiatry department while in the Cempaka room because he looked restless and confused. The patient experienced mood swings in the form of an unstable mood, accompanied by irritability, difficulty calming down, feeling uncomfortable, disturbed sleep, and decreased appetite after the patient underwent treatment at the hospital since last February. On physical examination, physical status was found within normal limits, nutritional status was good, and general status was within normal limits. Examination of psychiatric status found an unnatural appearance that looked confused and uncomfortable, verbal and visual contact was lacking, clear consciousness, mood and affect were labile, in thought processes there was preoccupation with the disease, in perception there were visual hallucinations.