in a group of 28 neonates , investigated within the first three months of life , only 10 % showed some abnormalities of the upper urinary tract and ( or ) reflux , in a second group of 21 children , over the age of 2 years when first seen , the occurrence rate of dilatation of the upper urinary tract and of pyelonephritis signs was already doubled , whereas adults with operated mmc showed in 75 % severe pathological changes .
C0021289
neonates
C0008059
children