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My Child Has:
Duplex Collecting System
Programs that treat this condition
Center for General Pediatric Urology  
What is a duplex collecting system?
In a normal urinary tract, each kidney is connected to one ureter, that drains urine into the bladder. Children with a duplex collecting system will have two ureters for one kidney that drain independently into the bladder, rather than one ureter for each kidney. This condition often occurs with a ureterocele. When a child has a ureterocele, the portion of the ureter closest to the bladder becomes enlarged because the ureter opening is very tiny and obstructs urine outflow. As the urine flow is obstructed, urine backs up in the ureter tube.

In a duplex collecting system, the ureter with the ureterocele generally drains the top half of the kidney while the duplicate may drain the lower half. The ureter with the ureterocele may enter the bladder lower than the duplicate ureter, which may cause a back-flow of urine into the higher ureter. An isolated duplex collecting system may be a completely benign condition and may not require therapy.

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Who is affected by ureteral duplication?
Ureteral duplication is much more common in girls than in boys
What causes ureteral duplication?
The cause of ureteral duplication is unknown, however, some cases have been reported in siblings, suggesting a genetic component.
How is duplex ureter and ureterocele diagnosed?
If a ureterocele is not detected on a prenatal ultrasound, it may not be detected until the child has recurrent urinary tract infections. If your child has a history of frequent urinary tract infections, your child's physician may order the following diagnostic procedures:
  • ultrasound of the entire urinary tract - a diagnostic imaging technique which uses high-frequency sound waves and a computer to create images of blood vessels, tissues, and organs. Ultrasounds are used to view internal organs as they function, and to assess blood flow through various vessels.
  • intravenous pyelogram (IVP) - a diagnostic imaging technique, which uses an x-ray to view the structures of the urinary tract. An intravenous contrast of dye is given so that the structures can be seen on film. An IVP also reveals the rate and path of urine flow through the urinary tract.
Treatment for a ureterocele with ureter duplication:
Treatment for ureterocele is very complex, individualized, and varies from child to child. Specific treatment for ureterocele or ureter duplication will be determined by your child's physician based on:
  • your child's age, overall health, and medical history
  • the extent of the condition(s)
  • your child's tolerance for specific medications, procedures, or therapies
  • expectations for the course of the condition(s)
  • your opinion or preference
If your child is ill from an urinary tract infection, intravenous fluids and antibiotics may be administered. Once the urinary tract infection is resolved, the ureterocele will be addressed. Treatment of the ureterocele often depends on the size of the constriction and the function of the kidney that the ureter is draining. If the area of the ureter has a great deal of urine accumulation, it may need to be surgically drained. Larger ureteroceles that may cause a great deal of reflux (or back-flow) into the ureter may need to be removed. If there is a duplicate ureter, the twin may be left intact.

In some children, the kidney of the affected side may be damaged and part of it may need to be removed.

Your child may be referred to a pediatric urologist (a physician who specializes in disorders and care of the urinary tract and the male genital tract). A small ureterocele may not require medical intervention if the kidney is functioning without difficulty.

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