What Causes Ectopic Ureter?

There are no known causes for this birth defect. This extra ureter just develops from a single kidney. It can happen in boys or girls, but is more common in girls. There is also no proof that something during pregnancy causes it.

It is known to be hereditary (passed down in a family). If you had an ectopic ureter, then each of your children has a one-half chance of having this duplicated system.