The authors report on indications, operative technic and clinical experience with the so-called horned bladder (horn-like extrusion) with simultaneous re-implantation and submucosal placement of the ureter. In 6 years the procedure was successfully employed in 35 patients. As compared to the Boari flap-method, it is simple, the anastomosis is without tension, and there is lessened danger of reflux because of the submucous tunnelling of the ureteral end.