A patient with transplanted kidney and immunosuppression treatment has been treated because of a total necrosis of ureter by a replacement of a ureter with a pyeloileocystoplasty. A second patient with transplanted kidney and immunosuppression therapy has been given care to with total cystectomy and supravesical derivation of the urine by a ileal conduit of a solid cancer or urinary bladder. The good clinical results, five, respectively two years after the operation confirm that neither kidney transplantation nor immunosuppression therapy are counter indications to the use of small intestine plastics of the bladder of the ureter.