<p>The paper gives the results of percutaneous electroresection of the renal pelvic wall with a tumor in 4 patients. The operation has been made for absolute indications: 3 patients had a single kidney and the fourth patient had a single functioning left kidney (the right pelvic dystopic kidney failed to function). In all the patients, the primary symptom of the disease was macrohematuria, the examination for which revealed a renal pelvic tumor measuring 1.2 to 2.5 cm in size. There were no complications after percutaneous electroresection of the renal pelvic wall with a tumor. Intrarenal BCG therapy was performed in the postoperative period. Percutaneous electroresection is indicated for tumors of the renal pelvis and the upper third of the ureter of the single kidney.</p
