Eleven cases of newborns with acrania and macroscopically diagnosed anencephaly were neuropathologically examined. They presented changes in which 1 group corresponded to the diagnosis of aprosencephaly. In the second group, the development of prosencephalic structures was more advanced. The pathomechanism of the observed anomalies was analyzed in relation to data provided by molecular-genetic classification of nervous system malformations, but that did not exclude the influence of eventual extrinsic factors.
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