A rare condition involving underdevelopment of brain tissue combined with failed nutrition or growth of what brain tissue does exist.
From Greek an- (without) plus encephalon (brain) plus trophia (nutrition), literally 'condition of brain without nutrition,' describing combined neurological and growth failure.
This term is rare in modern medicine because most cases of severe brain underdevelopment (anencephaly) are now identified prenatally, but it historically described infants born with both missing brain structures and failure of the remaining tissue to develop properly.
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