Encephalitis Lethargica or EL is an infectious disease that was first described by Dr Constantin von Economo in April 1917, and is sometimes referred to as "von Economo's disease". He defined the following different forms of the disease: somnolent-ophthalmoplegic, hyperkinetic, and amyostatic-akinetic. He also described postencephalitic Parkinsonism. Symptoms can emerge years after the original infection. The disease was defined by the following neuropathologic findings: "inflammatory changes in the tegmentum of the midbrain accounting for the sleep disturbance and ocular signs". 
The Encephalitis Lethargica disease occurred at the same time and following the aftermath of the infamous Spanish Flu. The film "Awakenings", from 1990, described some patients with this disease.
Disease recognition[edit | edit source]
The International Classification of Diseases categorizes EL in the category A85.8 "Other specified viral encephalitis". Encephalitis Lethargica has become much rarer over time, with the last study being published in 2012.
Notable studies[edit | edit source]
See also[edit | edit source]
Learn more[edit | edit source]
References[edit | edit source]
- Dickman, M. S. (Oct 2001). "von Economo encephalitis". Archives of Neurology. 58 (10): 1696–1698. ISSN 0003-9942. PMID 11594935.
- World Health Organization. "ICD-10 Version:2016 | A85.8". icd.who.int. Retrieved Apr 7, 2019.
- Vilensky, Joel A.; Hoffman, Leslie A. (Aug 1, 2017). "Encephalitis lethargica: 100 years after the epidemic". Brain. 140 (8): 2246–2251. doi:10.1093/brain/awx177. ISSN 0006-8950.