Complications include Obstruction, vesicoureteral reflux, urinary tract infections, and urinary calculus formation (due to urinary stasis) Urinary incontinence (due to abnormal termination of the ureter in the urethra, perineum, or vagina) Diagnosis of ureteral anomalies may be suggested by abnormalities on routine prenatal ultrasonography (eg, hydronephrosis) and occasionally by physical examination (eg, finding an external ectopic ureteral orifice or a palpable mass).