What Surgery Is Done for Hydronephrosis?

Reviewed on 11/19/2020
Hydronephrosis refers to the swelling of the kidney caused by collection of urine.

Hydronephrosis refers to the swelling of the kidney caused by the collection of urine.

Hydronephrosis refers to the swelling of the kidney caused by the collection of urine. Surgery would be recommended only in the most severe cases. The goal of the surgery is to reduce swelling and pressure in the kidney by establishing a free flow of the urine. The most common surgical procedure used for the treatment of hydronephrosis is pyeloplasty. Pyeloplasty repairs the most common type of blockage, that is, the blockage at the point where the kidney joins the ureter (ureteropelvic junction blockage). It removes the narrowed or obstructed part of the tube connecting the kidney to the bladder (ureter) and reconnects the healthy portion to the kidney’s drainage system. The surgeon  may perform pyeloplasty in:

What is hydronephrosis?

Hydronephrosis involves the collection of urine in the kidney due to incomplete emptying of the urinary tract. This results in swelling and obstruction of the kidney. The swelling or obstruction can occur at:

  • Opening of the kidneys into the ureters
  • The ureters
  • The bladder
  • The urethra

Hydronephrosis may be of two types:

  • Unilateral hydronephrosis (only one kidney is affected)
  • Bilateral hydronephrosis (both the kidneys are affected)

Hydronephrosis, if left untreated, can lead to kidney failure.

What causes hydronephrosis?

The most common causes of hydronephrosis include:

In women, hydronephrosis may occur as a result of:

  • Pregnancy (enlargement of the uterus can exert pressure on the ureters)
  • Uterine prolapse (uterus sags down from its normal position)
  • Cystocele (a condition where the wall between a woman’s bladder and her vagina weakens and allows the bladder to drop or sag into the vagina)


The only purpose of the kidneys is to filter blood. See Answer

What are the symptoms of hydronephrosis?

Hydronephrosis generally doesn’t cause any symptoms. If symptoms occur, they include:

In the case of electrolyte abnormalities, it may lead to:

How is hydronephrosis diagnosed?

The surgeon takes the history of the patient. They may also ask you to undergo specific tests, which include:

What is the treatment for hydronephrosis?

Acute or sudden hydronephrosis can be treated using a stent or soft tube (nephrostomy tube). The stent is inserted through the skin (percutaneously) into the kidney to drain off the urine. Treatment options for kidney or ureteral stones include:

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