HUMAN FETAL COMPENSATORY RENAL GROWTH

The occurrence of prenatal compensatory renal growth has remained in q uestion, despite the general acceptance of this phenomenon postnatally . We measured by ultrasound imaging the renal length of 22 human fetus es with a solitary kidney or contralateral multicystic dysplastic kidn ey, and compared it to measurements in 40 normal control fetuses. Rena l length was normalized to fetal biparietal diameter. Analysis of cova riance showed that the solitary kidneys were significantly larger than normal controls (p <0.0001), although the rate of growth was not sign ificantly increased above normal. These data document the presence of compensatory renal growth in human fetuses with solitary or functional ly solitary kidneys.