Fetal Renal Duplicated Collecting System at 14–16 Weeks of Gestation

Nizar Khatib*, Moshe Bronshtein, Gal Bachar, Ron Beloosesky, Yuval Ginsberg, Osnat Zmora, Zeev Weiner, Ayala Gover

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


(1) Background: To examine the incidence of the prenatal diagnosis of the renal double-collecting system (rDCS) and describe its clinical outcome and associated genetic abnormalities. (2) Methods: This retrospective study included women who attended the obstetric clinic for early fetal anatomic sonography with findings of a renal DCS. Diagnosis was conducted by an expert sonographer using defined criteria. (3) Results: In total, 29,268 women underwent early ultrasound anatomical screening at 14–16 weeks, and 383 cases of rDCS were diagnosed (prevalence: 1:76). Associated abnormalities were diagnosed in eleven pregnancies; four had chromosomal aberrations. No chromosomal abnormalities were reported in isolated cases. Ectopic uretrocele and dysplastic kidney were diagnosed in 6 (1.5%) and 5 (1.3%) fetuses, respectively. One girl was diagnosed with vesicoureteral reflux and recurrent UTIs, and two boys were diagnosed with undescended testis. The recurrence rate of rDCS was 8% in subsequent pregnancies. (4) Conclusions: In light of its benign nature, we speculate that isolated rDCS may be considered a benign anatomic variant, but a repeat examination in the third trimester is recommended to assess hydronephrosis.

Original languageEnglish
Article number7124
JournalJournal of Clinical Medicine
Issue number22
StatePublished - Nov 2023


  • early diagnosis
  • renal duplication
  • ultrasound


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