Catalog

Postencephalitic parkinsonism

No MMS code

Link to WHO Definition

Postencephalitic parkinsonism – http://id.who.int/icd/entity/1939015306

Parkinsonism (rigidity, bradykinesia, tremor, and postural instability) occurring in the setting of a viral illness triggering degeneration of the nerve cells in the substantia nigra. Historically was documented as a chronic complication of encephalitis lethargica (also known as Economo’s encephalitis or sleep sickness) that emerged during and after World War I.