Palliative drainage methods for malignant ureteral obstruction: comparative analysis

The present review provides an in-depth analysis of palliative drainage modalities for the upper urinary tract (UUT) in patients diagnosed with cancer-associated obstructive uropathy. Although nephrostomy-based drainage is widely acknowledged as a valid approach, prolonged utilization of external urinary drainage systems is associated with specific complications and exerts a considerable impact on patients’ quality of life. Consequently, the quest for an optimal variant of prolonged internal urinary tract drainage in this patient population remains an ongoing endeavor. The primary parameters constraining the efficacy of conventional ureteral stenting include stent patency compromise due to tumor compression and stent lumen occlusion resulting from encrustation. Furthermore, the prevalence of stent-related symptomatology in most patients represents a significant clinical concern. This review synthesizes the findings of studies that both elucidate the factors limiting the utility of ureteral stenting in this patient cohort and propose strategies to overcome these limitations through targeted interventions addressing the physical, chemical, and biological determinants of internal ureteral drainage failure.