apparently unrelated congenital anomalies occurred more frequently among probands with craniorachischisis ( 62 % ) , encephalocele ( 30 % ) , or multiple ntds ( 25 % ) than among probands with anencephaly ( 14.7 % ) or spina bifida ( 10.1 % ) ( p much less than .0001 ) .
C0027794
ntds
C0002902
anencephaly