During a 10 years period at the Department of Urology of the Surgical Clinic KBC "Bezanijska kosa" 32 patients were hospitalised with a single functional kidney, who were operated on and derivation operations of the ureter were performed. The reason for a derivating operation on the ureter was an infiltrative cancer of the urinary bladder in 24 patients. In 6 patients there was a recurrent vesico-vaginal fistula and in two multiple purulent ureterocutaneous fistulas. Derivant operations on the level of the ureter with a bowel loop of the ileum was performed in 24 patients, by ileocoecal conduit in 6; a ureterosigmoidostomy was performed in two patients. The complications of these surgical interventions and the remaining life span of these patients after the operation are presented.