[The diseases causing stenosis and obstruction of the ureter]

A total of 681 patients with stenosis and obstruction of the ureter (SOU) have been observed over a period of 5 years. The male/female ratio was 1:1.25. The etiologic factors for development of SOU have been as follows: calculus in the ureter--78 per cent of the total number of patients; infections of the ureter--8.1 per cent; posttraumatic injury to the ureter--6.5 per cent; congenital malformations of the ureter--4.2 per cent; papillary tumors of the ureter--2.7 per cent; retroperitoneal tumor--0.3 per cent.