Ureteral diverticulum.

Twelve patients with ureteral diverticula encountered in a 25-year period are presented. Although the potential for the development of such lesions may arise from congenital maldevelopments, we believe that in the natural history much depends on the abnormal hydrodynamic states that may be acquired in childhood or adult life. Ureteral diverticula are frequently asymptomatic, requiring no treatment.