Aim COVID-19 pandemic changed the priorities in medical field. Many elective surgeries for renal cell cancers (RCC) have been postponed. In this study, we aimed to examine the effects of the COVID-19 pandemic on the surgical treatment of RCC in Turkey. Methods 457 patients that underwent surgery for kidney tumor in the 2-year period between March 1, 2019 and February 28, 2021 in 9 centers in Turkey were analyzed retrospectively. Results The number of surgical treatments for RCC during the COVID-19 pandemic has decreased significantly compared to the same period before COVID-19. No significant differences were found between the two periods in terms of admission symptoms (p=0.32). However, while the rate of application due to hematuria was 6.1% in the pre-COVID-19 period, it was 13.1% during the COVID-19 period. Despite not being significant, this difference was still proportional. Two study periods differed significantly in terms of the rate of metastatic RCC detected in preoperative imaging (13.1% vs 6.1%, during COVID-19 and pre-COVID-19, respectively) (p=0.01). Moreover, the study periods differed significantly in terms of time between imaging and operation (55.98±51.02 vs 40.30±34.9 days, during COVID-19 and pre-COVID-19, respectively) (p=0.01). However, there was no significant difference between the two periods in terms of tumor size, type of surgery, and pathological stage (p>0.05). Conclusion There was a significant decrease in the number of RCC-related surgeries over 1-year period during the pandemic. However, the rate of surgery for metastatic disease increased. Covid-19 is a pandemic that continues to affect the whole world. Oncological diseases are negative affected in this process in terms of early diagnosis and treatment.

Aim: To examine the effect of ureterorenoscopic stone removal timing on kidney function in unilateral ureteral stones. Methods: The 137 patients sampled were divided into two groups: 98 patients who underwent surgery ≤ 14 days after the stone diagnosis (Early Surgery Group) and 39 patients who were operated> 14 days after the stone diagnosis (Late Surgery Group). Preoperative serum creatinine, blood urea nitrogen (BUN), and GFR were recorded for the patients in both groups. In the postoperative first mouth, serum creatinine, BUN, and GFR were again recorded and compared with the preoperative values. Result: The mean preoperative serum creatinine, GFR, and BUN levels for Early Surgery Group were 1.25 ± 0.65µmol/L, 80.04 ± 33.6ml/min/1.73m2, 50 ± 16.6mmol/L, respectively. While a decrease was observed in serum creatinine (0.82 ± 0.22µmol/L, p < 0.001) and BUN (14.08 ± 7.25mmol/L, p < 0.001) levels one month after surgery, the GFR increased (105.33 ± 21.6ml/min/1.73m2, p < 0.001). In Late Surgery Group, postoperative serum creatinine levels increased minimally (0.94 ± 0.33 vs. 0.95 ± 0.30µmol/L, p = 0.102), and GFR decreased (95.15 ± 27.3 vs. 93.77 ± 24.3ml/min/1.73m2, p = 0.338). Although there was an increase in BUN (17.38 ± 9 vs. 17.92 ± 8.8mmol/L, p = 0.283), the statistical difference was not significant. Conclusion: We believe that surgical treatment should be planned within two weeks at the latest, as prolonged obstruction may result in kidney damage