Duplex kidney causes two ureters (tube that drains urine into the bladder) that normally come from each kidney to come from a single kidney instead.
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In a normal urinary system, each of a child’s kidneys is connected to a single ureter (tube that drains urine into the bladder). In a child with a duplex kidney, two ureters are coming from a single kidney. Duplex kidneys can occur in only one or both kidneys. Duplex kidneys – also known as a duplicated collecting system – are a fairly common condition in healthy children, and usually do not require treatment.
The cause of duplex kidney is unknown, but is most likely due to genetic factors.
