Renoureteral bypass in obstructions and losses of substance of the initial ureter.

When the renal pelvis and the proximal ureter are destroyed, surgical repair is always difficult. In case of a loss of substance of the upper ureter, it is possible to replace the obstructed (or destroyed) segment and to preserve the healthy iliopelvic ureter. The 'renoureteric bypass' consists of the insertion of an intermediate segment between the lower calyx of the kidney and the lumboiliac ureter. A prosthesis or an intestinal loop may be used to restore the continuity of the urinary tract. The results obtained in dogs being excellent, the technique was applied successfully in man in 2 cases.