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Position of abnormal ureters

The normal ureter enters the base of the bladder to open into the bladder base in an area known as the trigone. In some cases, a ureter may enter away from this anatomical site. This is known as an ectopic ureter. Ectopic ureters may be single or part of a duplex system. They are often associated with obstructed drainage and, on occasion, may relate to a poorly functioning kidney.