[Two cases of ureteral tumors occurring after operation on bladder tumors].

Among 116 patients with bladder tumors treated during a 17-year period, 2 patients were found to have ureteral tumors (1.7%). The first case was found 8 years after transurethral resection (T.U.R.) and the second case was diagnosed as multiple ureteral tumors 3 years after six T.U.R.s. Long term follow-up by urinary cytology should be performed for patients with bladder tumors to find upper urinary tract tumors, especially for the patient with multiple bladder tumors.