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He was found by his mother dead in bed at 4 months of age; general autopsy revealed Klebsiella sepsis and pneumonia. Neuropathologic studies of the right cerebral hemisphere showed neuronal loss of the third cortical layer; Golgi studies revealed persistently immature cortical pyramidal cell somata and dendritic spines. This is the first report of specific neuronal abnormalities in a child with the maternal PKU syndrome and may, in part, account for the clinical features of microcephaly, mental retardation, and seizures seen in affected children. 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