1. No evidence of hydronephrosis or hydroureter.

2. Although US detected hydronephrosis and hydroureter in all 12 cases tumors, only 2 patients were positively diagnosed with ureteral tumor and 4 cases were indicated ureteral stricture.

3. The stasis from obstruction predisposes to infection. The obstruction can also lead to bilateral hydroureter and hydronephrosis.

4. This abdominal CT scan with contrast demonstrates right hydronephrosis and hydroureter as a consequence of ureteral obstruction.

5. Conclusion After the firearm fragment injury was made on the ureter of Beagle dogs, hydronephrosis and hydroureter occurred at the wounded side and got worse as time went on.