Lesions of the urinary tract occur in a constant percentage no matter what type of gynecological operation is performed. In the last 11 years we saw 150 immediately postoperative complications, 85 of which involved the ureter, 58 the bladder and 7 the urethra. 8 lesions of the ureter healed spontaneonsly. 15 ureters were mounted with a stent. Surgical treatment had to be performed on 62 ureters. 50 of which were ureteroplasties: 21 ureteroneocystostomies, 28 ureteroplasties with a bladder flap (Boari-Küss), 1 uretero-ureteral-anastomosis. The results were good in 80%. Therapy of vesical-fistulae consisted in operative closure 3 month after the primary lesion. (54 cases: 30 vaginal approaches, 7 transvesical approaches, 14 transvesical a. with a peritoneal flap and 3 transvesical a. with interposition of the omentum.) Continence was achieved in all but one cases. Two cases required a second intervention. 4. fistulas were treated only conservative, in 3 times successfull, one event of bladder abdominal-wall fistula. The 4th case was not closed because of the rejection of the operation from the patient. All urethral fistulae could be closed successfully.