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Unilateral hydronephrosis

  • Definition

    Unilateral hydronephrosis is swelling of one kidney due to a backup of urine.

    See also:  Bilateral hydronephrosis

    Alternative Names


    Causes, incidence, and risk factors

    Hydronephrosis is a condition that occurs with a disease. It is not a disease itself. Conditions that are often associated with unilateral hydronephrosis include:

    • Acute unilateral obstructive uropathy
    • Chronic unilateral obstructive uropathy
    • Vesicoureteric reflux (backflow of urine from bladder to kidney)
    • Nephrolithiasis (kidney stones)
    • Hydronephrosis that occurs without a known cause during pregnancy

    Unilateral hydronephrosis occurs in approximately 1 in 100 people.