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Hydronephrosis is the abnormal dilatation of the kidney. Hydroureter is the abnormal dilatation of the ureter. Patients can have either hydronephrosis or hydroureter or both. Most hydronephrosis does not harm the kidneys, but some cases are associated with poorly kidney function.

Several diagnoses can result in urinary tract dilatation. Causes include:

  • Ureteropelvic junction obstruction
  • Ureterovesical junction obstruction also known as Megaureter
  • Vesicoureteral reflux
  • Ectopic ureter

Hydronephrosis can affect one (unilateral) or both (bilateral) kidneys and it resolves on its own in about half of all cases.

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Physician Access Line

Need to reach a Children's National specialist for a quick consult about a patient in your care? Call our Physician Access Line at 202-476-4880.

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Our physician liaisons help providers with referring a patient for treatment, providing referral pads and obtaining medical records. Leave us a message and we'll follow up with you.

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Outpatient Appointment Referral Pads (PDFs)

Download the version you'd like below, or request to have one be mailed to you .

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