What is the prevalence and causes of hydronephrosis and hydroureter by age?

Updated: Dec 16, 2020
  • Author: Dennis G Lusaya, MD; Chief Editor: Bradley Fields Schwartz, DO, FACS  more...
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Answer

In young adults, calculi are the most common causes of hydroureter and hydronephrosis.

In children and in neonates, the relative frequency of the causes of antenatal hydronephrosis has been determined to be as follows:

  • Transient - 48%
  • Physiologic -15%
  • Ureteropelvic junction obstruction - 11%
  • Vesicoureteral reflux - 9%
  • Megaureter - 4%
  • Multicystic dysplastic kidney - 2%
  • Ureterocele - 2%
  • Posterior urethral valves - 1%

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