NCIt definition : A rare, slowly progressive post-infectious neurological disorder affecting the central
nervous system. It is characterized by seizures, ataxia, myoclonus, personality changes,
spasticity, and coma. The symptoms appear several years following measles infection
at an early age.;
Alternative definition : NICHD: An encephalitic disorder that occurs following a measles infection. The disease
initially manifests as personality changes, and then progresses to muscle spasms and
seizures, possibly death.;