Movement disorders associated with encephalitis lethargica: a video compilation.

Encephalitis lethargica (EL; epidemic encephalitis; von Economo's disease) often presented with a movement disorder, and the motor consequences of postencephalitic parkinsonism (PEP) were characteristic of the chronic sequelae of this condition. PEP was similar to Parkinson's disease but was more variable and had some distinct features such as oculogyric crises. Although two previous publications have included video images of the movement disorders associated with EL and PEP, the sequences presented were typically short, showed only a few patients, and did not include the work of several neurologists who had the foresight to preserve filmed images of their patients. We describe the most complete record of EL and PEP moving images that have been preserved and make them available in edited form.