Developmental and epileptic encephalopathies (DEE) constitute an expanding group of severely disabling and, most frequently, drug-resistant disorders starting in the first year of life. Among them, there is DEE43, caused by dominant mutations in the GABRB3 gene. We present first neuropathological findings in a novel, molecularly confirmed case with the fatal course. The neuropathological analysis revealed co-existing developmental anomalies and retardation of myelination resulting from disturbed early brain growth as well as lesions caused by epileptic hypoxic-ischemic episodes.
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