[Significance and consequences of mild fetal kidney pelvis dilatation]. / Bedeutung und Konsequenzen milder fetaler Pyelondilatationen.

Even mild fetal pyelectasia is a subject to post-partal control. As fetal kidneys can easily be examined by ultrasound, different degrees of dilatation are found, but the discrimination between normal and pathological has not yet been defined. We considered any dilatation of less than 7 mm als normal. 52 fetuses were found to have a dilatation of 7 mm and more. 8 of them required post partum surgery: 2/15 classified as Grignon grade I, 3/14 as Grignon II, and 3/3 as Grignon III. Further malformations in addition to pyelectasia require a prenatal caryotyping procedure.