[Natural history of fetal uropathies. Experience in 40 cases].

Appropriate management of fetal uropathies depends on accuracy in assessing the severity of urinary tract obstruction and renal damage, and in predicting the potential for recovery after surgical correction. A review of 40 fetuses aged between 20 an 39 weeks referred to us for prenatal counseling for a suspected anomaly of the urinary tract, has been made. Reliability of our diagnostic resources has been retrospectively evaluated on the basis of clinical, ultrasonographic and radiological postnatal data. Conservative approach has been adopted in all our cases. None intrauterine surgery was attempted; pre term delivery was advised only in two cases. Our results confirm poor prognosis of fetuses with marked decrease of amniotic fluid within the 24th week of gestational age. After this date the amount of amniotic fluid alone may not be a completely reliable prognostic factor. Ultrasonographic aspect of fetal kidneys and, in some occasions, chemical analysis of fetal urines may accomplish our prenatal study and help to predict the degree of neonatal renal function and potential of survival.