Landau-Kleffner syndrome (LKS)
What is Landau-Kleffner Syndrome?
Doctors might suspect LKS if your child begins to lose language skills, initially not recognizing or understanding words that had been familiar. This is called "word deafness" or "verbal auditory agnosia" and it typically occurs in combination with an abnormal electroencephalogram that shows sleep-activated spike or spike and wave discharges.
Sometimes, children suspected of having LKS have pervasive developmental disorder (PDD), autism with regression, a congenital disorder such as developmental speech delay, or another epileptic syndrome called electrical status epilepticus of sleep (ESES).