Parkinson Disease, Postencephalitic

**Definition:** Parkinsonism following encephalitis, historically seen as a sequella of encephalitis lethargica (Von Economo Encephalitis). The early age of onset, the rapid progression of symptoms followed by stabilization, and the presence of a variety of other neurological disorders (e.g., sociopathic behavior; TICS; MUSCLE SPASMS; oculogyric crises; hyperphagia; and bizarre movements) distinguish this condition from primary PARKINSON DISEASE. Pathologic features include neuronal loss and gliosis concentrated in the MESENCEPHALON; SUBTHALAMUS; and HYPOTHALAMUS. (From Adams et al., Principles of Neurology, 6th ed, p754)

**Tree numbers:** - C10.228.140.079.862.800.600 - C10.228.662.600.700.500

**Synonyms:** - Encephalitis Lethargica Type Parkinsonism - Parkinson Disease, Post-Encephalitic - Parkinsonian Syndrome, Postencephalitis - Parkinsonism, Postencephalitic - Post-Encephalitic Parkinson Disease - Postencephalitic Economo-Type Parkinsonism - Postencephalitic Parkinson Disease - Postencephalitic Parkinsonism - von Economo Encephalitis Type Parkinsonism