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  • Lennox Gastaut syndrome - the presence of generalized tonic seizures suggests Lennox Gastaut syndrome, focal motor seizures are rare in Lennox Gastaut syndrome
  • Epileptic encephalopathy with continuous spike-and-wave during sleep - although both syndromes may have progressive cognitive, behavioral and psychiatric impairments, if acquired aphasia is the predominant feature then a diagnosis of Landau Kleffner syndrome is appropriate (the presence of slow spike-and-wave on EEG is not mandatory for diagnosis)
  • Language regression due to other etiologies
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