case_images: PMC10085642_01
case_images: Upper ureteral reconstruction with a tapered segment of descending colon. (
  A
  ) Preoperative retrograde pyelography revealed a 5-cm-long stenosis of the ureter (
  white arrowheads
  ). (
  B
  ) An 8-cm-long descending colon (
  A
  ) was isolated, tapered (
  red dotted line
  ), sutured in a funnel shape, and then anastomosed to reconstruct the upper ureter. The photograph shows the colon segment being grasped before being tapered and sutured using a catheter as a temporary stent. (
  C
  ) The final outcome with a double J stent, percutaneous nephrostomy tube, and retroperitoneal drain.
case_images: 10-1055-a-2035-4637-i2022060667cr-1.jpg
case_images: PMC10085642_01_10-1055-a-2035-4637-i2022060667cr-1.jpg
case_images: FI2022060667cr-1
case_images: At presentation when he was almost 13 years old, the RP identified a 5-cm-long stenosis at the UPA and hypoperistalsis of the UPJ and upper ureter ( Fig. 1A ). Some 3 cm of the inflamed lower ureter was also resected ( Fig. 1A ) until the ureter appeared healthier. Because the upper cut end of the old UPA was no more than a fine opening ( Fig. 1B ), it was incised and the incision extended to the renal parenchyma. An 8-cm segment of the mobilized colon with intact blood vessels was isolated, tapered, and sutured into a funnel shape with an upper diameter of 2 cm and a lower diameter of 1 cm ( Fig. 1A, B ) around a 14-Fr catheter as a temporary stent. A 9-Fr percutaneous nephrostomy tube and a 15-Fr retroperitoneal drain were placed ( Fig. 1C ).
case_images: Postoperative urography. Smooth urine flow through the (
  A
  ) calyx-tapered segment of descending colon (TDC) anastomosis 13 days postoperatively and through the (
  B,C
  ) ureter-TDC anastomosis 49 days postoperatively.
case_images: 10-1055-a-2035-4637-i2022060667cr-2.jpg
case_images: PMC10085642_01_10-1055-a-2035-4637-i2022060667cr-2.jpg
case_images: FI2022060667cr-2
case_images: Contrast pyelography via the percutaneous nephrostomy tube the next day showed passage through the calyx-TDC anastomosis but not through the ureter-TDC anastomosis ( Fig. 2A ).