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Female urinary tract
Female urinary tract


Male urinary tract
Male urinary tract


Unilateral hydronephrosis

Definition:

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

See also:  Bilateral hydronephrosis



Alternative Names:

Hydronephrosis; Chronic hydronephrosis; Acute hydronephrosis; Urinary obstruction



Causes, incidence, and risk factors:

Hydronephrosis (kidney swelling) 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
  • Blockage of a ureter due to scarring, tumor, urinary stones
  • 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.



Symptoms:
  • Flank pain
  • Abdominal mass
  • Nausea and vomiting
  • Urinary tract infection
  • Fever
  • Painful urination (dysuria)
  • Increased urinary frequency
  • Increased urinary urgency

Note: Sometimes unilateral hydronephrosis does not have symptoms.



Signs and tests:

Unilateral hydronephrosis is found on an imaging test such as:



Treatment:

Treatment and prognosis for unilateral hydronephrosis depend on what is causing the kidney swelling. Treatment may include:

  • A ureteral stent (tube that allows the ureter to drain into the bladder)
  • A nephrostomy tube (allows the blocked urine to drain through the back)
  • Antibiotics for infections

Patients who have only one kidney, who have immune-compromising disorders such as diabetes or HIV, or who have received a transplant should be treated promptly.

Preventative antibiotics may be prescribed to decrease the risk of urinary tract infections in patients who have long-term hydronephrosis.



Support Groups:



Expectations (prognosis):

Prolonged hydronephrosis results in the eventual loss of kidney function.



Complications:

If hydronephrosis is left untreated, the affected kidney may be permanently damaged. Kidney insufficiency or kidney failure is rare with unilateral hydronephrosis because the other kidney usually functions normally. However, if the patient has only one functioning kidney, kidney failure will occur.



Calling your health care provider:

Call your health care provider if you have prolonged or severe flank pain, or if you suspect hydronephrosis.



Prevention:

Prevention of the disorders associated with unilateral hydronephrosis will prevent this condition.



References:

Zeidel ML.Obstructive uropathy. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 125.

SinghI, Strandhoy JW, Assimos DG. Pathophysiology of urinary tract obstruction. In: Wein AJ, ed.Campbell-Walsh Urology. 10th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 40. 




Review Date: 4/16/2012
Reviewed By: Linda J. Vorvick, MD, Medical Director and Director of Didactic Curriculum, MEDEX Northwest Division of Physician Assistant Studies, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington. Louis S. Liou, MD, PhD, Chief of Urology, Cambridge Health Alliance, Visiting Assistant Professor of Surgery, Harvard Medical School. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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