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The results of organ-preserving interventions are analyzed in 12 patients (7 males and 5 females) with neoplasms of the renal pelvis and ureter. Endoscopic operations were performed in 4 patients with the normally functioning contralateral kidney and in one patient with the single kidney. Early complications developed in 2 of the 12 patients and were infectious and inflammatory. The mean duration of endoscopic surgery was 32.8±4.9 min; intraoperative blood loss is 83.0±15.3 ml; the duration of open surgery averaged 157.2±29.7 min and intraoperative blood loss was 1930±69.3 ml. After 4 years of a follow-up, the frequency of tumor relapse was 40%; 5-year survival was 80%. Thus, in patients with upper urinary tract neoplasms, organ-preserving operations are a justifiable alternative to nephroureterectomy with urinary bladder resection and most reasonable in uni- and bilateral renal tumor. Urinary tract endoscopic examination assessing the possibilities of freely manipulating an endoscope in the ureteral lumen and renal cavitary system for biopsy of a tumor and its further removal is a major and determining factor in defining indications for this type of intervention.

The paper analyzes procedures for internal drainage of the upper urinary tract in ureteral tumor obstructions. It details indications for and contraindications to ureteral stenting or endoprostethic replacement, subcutaneous nephrovesical bypass. Postoperative complications and procedures for their prevention and treatment are considered. The data available in the literature on rare drainage procedures for the upper urinary tract, such as ureteral endoprosthetic replacement and nephrovesical bypass, are summarized.