Extrinsic enteroureteroplasty: a piggyback technique for mid-ureteric replacement.

Replacement of the ureter was performed in 10 piglets using a serosa-lined intestinal tube. It was constructed by plication of the intestine and closing it at the antemesenteric border. The tube was then interposed to bridge a ureteral defect of variable length (4-6 cm). Information from IVU and macroscopic and microscopic results showed that the function of the interposed segments was achieved in all cases, however, with significant stenosis in the absence of adequate postoperative splinting in 5 cases, and neomucosa - similar to uroepithelium in the beginning and a complete urothelium after 3 months - covered the interpositioned tube.