The Landau Kleffner  syndrome (LKS) or the syndrome of acquired epileptic aphasia was first described in 1957. LKS also called infantile acquired aphasia, acquired epileptic aphasia or aphasia with convulsive disorder. It is a rare childhood neurological syndrome. LKS is an epilepsy syndrome involving progressive neuropsychological impairment related to the appearance of paroxysmal electroencephalograph (EEG) activity. The disorder is characterized by gradual or rapid loss of language in a previously normal child. Affected children who have developed age-appropriate speech then experience language regression with verbal auditory agnosia, abnormal epileptiform activity, behavioural disturbances, and sometimes overt seizures. Behavioral disorders such as hyperactivity, aggressiveness and depression can also accompany this disorder
