To investigate ureteral obstruction, CT scan should be performed to confirm the location and the exact number of small or radiolucent calculi and ureteral stenosis. Renal scintigraphy can be used as an assistant to decision to plan in surgical procedure by evaluating renal function in each kidney. Moreover, an extended period of renal function recovery to normal status relates to an increased period of obstruction. Therefore, surgical treatment should be performed as soon as possible after detected of the obstruction. Surgical procedure was conducted with surgical microscope that is mandatory for delicate procedures such like treating ureter of cats. Consequently, consideration for anatomical reconstruction is the best treatment for ureter
