[Source:  The ASHA Leader]

Dillon was a bright, normally developing child with no apparent illnesses or language delay, but at about age 31/2, his nursery school teachers began to notice changes in his behavior. Hearing loss was suspected because he did not respond when called, but the results of an audiological evaluation were normal. His teachers continued to have concerns, but it was not until a full year later that Dillon experienced a severe regression in language functioning and was diagnosed with a rare epileptic disorder, Landau-Kleffner Syndrome (LKS).
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