Duplicated Collecting System

Tamara T. Chao, Jodi S. Dashe

Research output: Chapter in Book/Report/Conference proceedingChapter


Duplication of the renal collecting system is recognized in approximately 1: 4000 pregnancies and is more frequent in females. It disproportionately affects the left kidney, and is bilateral in 15% to 20% of cases. Ultrasound (US) may show dilatation of one or both renal pelves, with an intervening band of renal tissue. Ureteral dilatation may be evident, and there may be a ureterocele visible in the bladder. The Weigert-Meyer rule describes the relationship of the ureters. The upper pole ureter inserts medially and inferiorly to the lower pole ureter, with obstruction of the upper pole moiety secondary to a ureterocele. The lower pole ureter inserts laterally in the bladder trigone and has a shortened intravesical segment that leads to reflux. When a diagnosis of a duplicated collecting system is made prenatally, neonatal evaluation is important, as these individuals are prone to reflux, obstruction, and urinary tract infection.

Original languageEnglish (US)
Title of host publicationObstetric Imaging
Subtitle of host publicationFetal Diagnosis and Care: Second Edition
PublisherElsevier Inc.
ISBN (Electronic)9780323497367
ISBN (Print)9780323445481
Publication statusPublished - Sep 13 2017



  • Duplex kidney
  • Ureterocele
  • Weigert-Meyer rule

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Chao, T. T., & Dashe, J. S. (2017). Duplicated Collecting System. In Obstetric Imaging: Fetal Diagnosis and Care: Second Edition (pp. 50-53.e1). Elsevier Inc.. https://doi.org/10.1016/B978-0-323-44548-1.00013-9