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Encephalitis lethargica or von Economo disease is an atypical form of encephalitis. Also known as "sleepy sickness" (though different from the sleeping sickness transmitted by the tsetse fly), it was first described in 1917 by the neurologist Constantin von Economo〔K. von Economo. Encepahlitis lethargica. ''Wiener klinische Wochenschrift'', May 10, 1917, 30: 581-585. Die Encephalitis lethargica. Leipzig and Vienna, Franz Deuticke, 1918.〕 and the pathologist Jean-René Cruchet.〔Cruchet R, Moutier J, Calmettes A. « Quarante cas d'encéphalomyélite subaiguë » Bull Soc Med Hôp Paris 1917;41:614-6.〕 The disease attacks the brain, leaving some victims in a statue-like condition, speechless and motionless. Between 1915 and 1926, an epidemic of encephalitis lethargica spread around the world; no recurrence of the epidemic has since been reported, though isolated cases continue to occur. ==Symptoms== Encephalitis lethargica is characterized by high fever, sore throat, headache, lethargy, double vision, delayed physical and mental response, sleep inversion and catatonia.〔 In severe cases, patients may enter a coma-like state (akinetic mutism). Patients may also experience abnormal eye movements ("oculogyric crises"), parkinsonism, upper body weakness, muscular pains, tremors, neck rigidity, and behavioral changes including psychosis. Klazomania (a vocal tic) is sometimes present. Postencephalitic parkinsonism may develop after a bout of encephalitis, more commonly in the post-encephalitic phase and often after a latent period of several years. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Encephalitis lethargica」の詳細全文を読む スポンサード リンク
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