title: Renal pyelectasis in pregnancy: correlative evaluation of fetal and maternal collecting systems.
abstract: OBJECTIVE
  The current study is aimed at assessing the possibility of a statistical relationship between fetal and maternal collecting system dilatation during pregnancy.
  
  
  METHODS
  Two hundred thirty consecutive pregnant women and their fetuses (20 to 40 weeks' gestation) were simultaneously examined by ultrasonography. The renal collecting systems were measured, and the frequency of dilatation was subjected to chi 2 analysis. The temporal incidence of fetal pyelectasis was compared with the maternal incidence.
  
  
  RESULTS
  Dilatation of maternal collecting systems was detected in 91 of 230 patients (40%) and fetal pyelectasis occurred in 60 of 230 (26%). Fetal pyelectasis was 5.6 times more likely to occur in fetuses of mothers with dilated collecting systems. Furthermore, the temporal incidence of fetal pyelectasis throughout pregnancy appeared similar to that of maternal pyelectasis.
  
  
  CONCLUSIONS
  This study points out the existence of a statistically significant association between maternal and fetal collecting system dilatation during pregnancy.
authors.affiliation: Department of Diagnostic Imaging, Chaim Sheba Medical Center, Tel Hashomer, Israel.
authors.forename: M
authors.initials: M
authors.lastname: Graif
authors.forename: A
authors.initials: A
authors.lastname: Kessler
authors.forename: S
authors.initials: S
authors.lastname: Hart
authors.forename: M
authors.initials: M
authors.lastname: Daitzchman
authors.forename: S
authors.initials: S
authors.lastname: Mashiach
authors.forename: H
authors.initials: H
authors.lastname: Boichis
authors.forename: Y
authors.initials: Y
authors.lastname: Itzchak
mesh_terms: D016009:Chi-Square Distribution; D004108:Dilatation, Pathologic / Q000000981:diagnostic imaging; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D006869:Hydronephrosis / Q000000981:diagnostic imaging; D007674:Kidney Diseases / Q000000981:diagnostic imaging*; D007682:Kidney Pelvis; D007685:Kidney Tubules, Collecting / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000000981:diagnostic imaging*; D016216:Ultrasonography, Prenatal