SSPE
      n : a rare chronic progressive encephalitis caused by the
          measles virus and occurring primarily in children and
          young adults; death usually occurs within three years;
          characterized by primary measles infection before the age
          of two years [syn: subacute sclerosing panencephalitis,
           inclusion body encephalitis, {subacute inclusion body
          encephalitis, sclerosing leukoencephalitis, {subacute
          sclerosing leukoencephalitis, Bosin's disease, {Dawson's
          encephalitis, Van Bogaert encephalitis]