Tag Archives: mask-like facial appearance

Encephalitis lethargica

Front page of Encephalitis lethargica. Its sequelae and treatment by Constantin Von Economo, 1931. Via Wikimedia. Encephalitis lethargica was a worldwide epidemic during the years 1918-1930 that resembled influenza. It was first described in Vienna in 1916 by Constantin von Economo in thirteen patients suffering from unusual neurological symptoms that he thought constituted a new […]