Ectopic ureter (or ureteral ectopia) is a medical condition where the ureter, rather than terminating at the urinary bladder, terminates at a different site.

[5] Ectopic ureters are found in 1 of every 2000–4000 patients,[6] and can be difficult to diagnose, but are most often seen on CT scans.

[8] The embryology that explains the pathology of an ectopic ureter is a cephalad origin of the ureteral bud on the mesonephric duct.

With an abnormally long common excretory duct, the ureter never becomes incorporated into the bladder, and, therefore, remains ectopic.

In the female, the most common locations of an ectopic ureter are the bladder neck, urethra, or Gartner's duct which lies between the urethra and the anterior vaginal wall.