[Possible factors affecting dilatation of maternal kidney calices in pregnancy].

In a retrospective analysis we examined several factors in regard to the dilatation of the renal calyces during pregnancy in a normal group of 187 pregnant women between 8 and 42 weeks of pregnancy. The dilatation of the calyceal system was more frequent in case of preceded pyelonephritis, in primipara and bipara, and in younger pregnant patients. We found a significant increase of the dilatation with progress of pregnancy.