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encephalitis lethargica encephalitis le·thar·gi·ca (lə-thär'jĭ-kə)
A viral epidemic encephalitis characterized by apathy, paralysis of an eye muscle, and extreme muscular weakness. Also called sleeping sickness, von Economo's disease.
encephalitis en·ceph·a·li·tis (ěn-sěf'ə-lī'tĭs)
n. pl. en·ceph·a·lit·i·des (-lĭt'ĭ-dēz)
Inflammation of the brain. Also called cephalitis.
An inflammation of the brain. Encephalitis may be caused by a virus or lead poisoning, or it may be a complication of another disease, such as influenza or measles. Encephalitis can cause permanent brain damage or death. It is also possible, however, to recover from it completely.