An original ureteroileal reimplantation technique in which the ureter is placed in a sulcus created in the ileal mucosa was performed on 51 patients (97 ureters). Followup ranged from 3 to 8 years. As determined by excretory urography, retrograde ileography and urine bacteriology studies the method was effective in 85 per cent of the patients, with a low rate of stenosis (1.5 per cent). The use of this technique, initially limited to patients with the U-shaped continent ileal bladder, has been broadened to include those who undergo various reconstructive or urinary diversion procedures that require ureteroileal reimplantation.