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subacute sclerosing panencephalitis
Subacute sclerosing panencephalitis (SSPE) also known as Dawson Disease, Dawson encephalitis, and measles encephalitis is a rare and chronic form of progressive brain inflammation caused by a persistent infection with measles virus (which can be a result of a mutation of the virus itself). The condition primarily affects children and young adults. It has been estimated that about 1 in 10,000 people infected with measles will eventually develop SSPE. No cure for SSPE exists and the condition is often fatal. However, SSPE can be managed by medication if treatment is started at an early stage. Much of the work on SSPE has been performed by the National Institute of Neurological Disorders and Stroke (NINDS).
SSPE should not be confused with acute disseminated encephalomyelitis which has a similar etiology but very different timing and course.
==Signs and symptoms==
Characterized by a history of primary measles infection usually before the age of 2 years, followed by several asymptomatic years (6–15 on average), and then gradual, progressive psychoneurological deterioration, consisting of personality change, seizures, myoclonus, ataxia, photosensitivity, ocular abnormalities, spasticity, and coma.
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