Metastatic ureteral masses are not rare, but isolated ureteral metastasis from the origin of gastric cancer is rare. Ureteral metastasis is usually unilateral and does not lead to postrenal azotemia unless in single kidney patients. Herein, we describe an 80-year-old man with a history of nonmetastatic gastric cancer who presented with postrenal azotemia due to the coincidence of right distal ureteral metastasis and left distal ureteral stone.

Purpose To evaluate the effect of potassium citrate administration on the composition of encrusted material on the ureteral stent after Double-J insertion. Methods We designed a randomized clinical trial for our study; 65 patients that underwent transurethral lithotripsy and Double-J stent insertion were included in the study after informed consent and divided into two groups. In the first group (33 patients) potassium citrate was prescribed after surgery till stent removal and the second group (32 patients) followed without prescribing this medication. After stent removal, encrusted materials on removed stents were analyzed then the type and composition of encrusted material compared with the primary stone that was removed. Results Our results revealed that the type and composition of primary stone and encrusted stone were similar in patients that do not receive potassium citrate ( p -value of 0.073, 0.251 and 0.944 for calcium oxalate, uric acid, and calcium phosphate respectively). In patients that taking potassium citrate rate of calcium oxalate ( p -value < 0.001) and uric acid ( p -value < 0.001) material on encrusted stent significantly decreased compared with the non-intervention group. Conclusion Results of this study revealed that taking of potassium citrate after ureteral stent insertion significantly decreases the formation of calcium oxalate and uric acid encrusted material on Double-J stent so it could be recommended for prevention of stent encrustation in patients that primary stone analysis are calcium oxalate and uric acid stone.

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Introduction: Due to the extensive use of indwelling stents and catheters in urology, bacterial colonization on these materials is a significant cause of infections in this group of patients. This study aims to investigate and compare the bacterial colonization in urine and in the three zones of the double J (DJ) stent. Methods: Between August 2019 and May 2020, 67 patients (18–78 years old) who underwent DJ stenting were recruited in the study. Surgeries before stenting included transurethral lithotripsy (TUL), percutaneous nephrolithotomy (PCNL), or diagnostic ureteroscopy. Before stenting, sterile urine samples were collected, and urinary cultures were performed, and the same procedure was done after removal of the DJ stents. DJ stent cultures were also performed. Results: 61 patients were analyzed. The mean age of all patients was 53 ± 16 years. The mean time of DJ installation in all patients was 27.6 ± 6.7 days (14–43 days). In these three parts of the DJ, 70.5%, 67.2%, and 72.1% of patients were without a colony, respectively. The microorganism distribution is approximately the same in the lower and upperparts, and Escherichia coli has the highest frequency (11.5%). The odds ratio (OR) of contamination was significantly lower in men than in women, but overweight and diabetes were not associated. Conclusion: The severity and pattern of bacterial colonization are not significantly different in the proximal, distal, and middle parts of the DJ stent.