Megaureter is an abnormality of one or both of the ureters of a child.
Ureters are the two funnel-shaped tubes that carry urine from the kidneys to the bladder.
A megaureter refers to an expanded or widened ureter that does not function normally. The size of a megaureter is usually greater than 7 millimeters in diameter. Complications associated with megaureter include reverse flow of urine into the kidneys, and pooling of urine inside the ureter that does not drain. The pooling can cause a child to develop a urinary tract infection. In some children, complications from megaureter can cause kidney damage and failure.