Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Rasmussen's Encephalitis ?
    ### Response:
    Rasmussens encephalitis is a rare, chronic inflammatory neurological disease that usually affects only one hemisphere of the brain. It usually occurs in children under the age of 10 (more rarely in adolescents and adults), and is characterized by frequent and severe seizures, loss of motor skills and speech, paralysis on one side of the body (hemiparesis), inflammation of the brain (encephalitis), and mental deterioration.
    