Experience of complete duplication of the collecting system: retrospective analysis of 23 cases with particular emphasis on the type of ureteral hiatus and its implication in the management of duplex.

Twenty-three cases of complete duplication of the collecting system are reviewed. The type of ureteral hiatus was retrospectively studied to assess its relation to various abnormalities of the duplex system. It was stressed that the hiatal concept is quite important in understanding the multifarious problems of the pathophysiology of ureteral dilation, surgical management and faulty embryogenesis of the kidney and ureterovesical junction of the duplex system.