A ureterocele is a swelling at the bottom of one of the ureters. Ureters are the tubes that carry urine from the kidney to the bladder. The swollen area can block urine flow.
A ureterocele is a birth defect.
A ureterocele occurs in the lower part of the ureter. It is the part where the tube enters the bladder. The swollen area prevents urine from moving freely into the bladder. The urine collects in the ureterocele and stretches its walls. It expands like a water balloon.
A ureterocele can also cause urine to flow backward from the bladder to the kidney. This is called reflux.
Ureteroceles occur in about 1 in 500 people. This condition is equally common in both the left and right ureters.
Most people with ureteroceles do not have any symptoms. When symptoms do occur, they may include:
- Abdominal pain
- Back pain that may be only on one side
- Severe side (flank) pain and spasms that may reach to the groin, genitals, and thigh
- Blood in the urine
- Burning pain while urinating (dysuria)
- Difficulty starting urine flow or slowing of urine flow
- Urinary tract infection
Some other symptoms are:
Exams and Tests
Large ureteroceles are often diagnosed earlier than smaller ones. It may be discovered in a pregnancy-related ultrasound before the baby is born.
Some people with ureteroceles do not know they have the condition. Often, the problem is found later in life due to kidney stones or infection.
A urinalysis may reveal blood in the urine or signs of urinary tract infection.
The following tests may be done:
- Abdominal ultrasound
- CT scan of the abdomen
- Cystoscopy (examination of the inside of the bladder)
- Radionuclide renal scan
- Voiding cystourethrogram
Blood pressure may be high if there is kidney damage.
Antibiotics are often given to prevent further infections until surgery can be done.
Surgery to repair the ureterocele cures the condition in most cases. Your surgeon may cut into the ureterocele. Another surgery may involve removing the ureterocele and reattaching the ureter to the bladder. The type of surgery depends on your age, overall health, and extent of the blockage.
The outcome varies. The damage may be temporary if the blockage can be cured. However, damage to the kidney may be permanent if the condition doesn't go away.
Kidney failure is uncommon. The other kidney will most often work normally.
Complications may include:
- Long-term bladder damage (urinary retention)
- Long-term kidney damage, including loss of function in one kidney
- Urinary tract infection that keeps coming back
When to Contact a Medical Professional
Contact your health care provider if you have symptoms of ureterocele.
Incontinence - ureterocele
Guay-Woodford LM. Hereditary nephropathies and developmental abnormalities of the urinary tract. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 119.
Stanasel I, Peters CA. Ectopic ureter, ureterocele, and ureteral anomalies. In: Partin AW, Dmochowski RR, Kavoussi LR, Peters CA, eds. Campbell-Walsh-Wein Urology. 12th ed. Philadelphia, PA: Elsevier; 2021:chap 41.
Review Date 7/4/2022
Updated by: Kelly L. Stratton, MD, FACS, Associate Professor, Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, OK. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.