The authors report on 58 patients with ureteral stump disease. Therapeutic errors, certain specific conditions, but also nephrectomies done for diseases other than pyelo-calyceal tumors and tuberculosis may increase the severity of ureteral stump pathology. The clinical symptoms are often vague, and are demonstrated too late. The incidence may be reduced and the outcome improved by removal of the ureter whenever favourable conditions for development exist, and by looking for them by efficient exploration and complete excision, if nephrectomy is followed by even less marked changes.