Since the use of computed tomography(CT) to stage the bladder cancer ts still controversial, the effect of CT on pelvic lymphadenopathy of recurrent bladder cancer was studed to determine whether that is an appropriate routine screening test for recurrent bladder cancer Seventy-five patients with bladder cancer who underwent radical cystectomy were entered into the first study. The following information was collected for each patient: stage, grade, CT report and report of pathology findings. The above data were expected to assist understanding of the accuracy of computed tomography on pelvic lymphadenopathy. In the second study, 222 cases diagnosed with "recurrence of bladder cancer" were collected before March 1994. The gold standard of pelvic lymph node metastasis was prolonged follow-up (more than two years) and] or pathology findings. The incidence of lymph node metastasis of recurrent bladder cancer and the accuracy of CT on lymphadenopathy of recurrent bladder cancer are reported in this paper. Fifty-three out of 79 patients underwent radical cystectomy. The overall sensitivity and specificity of CT scan on pelvic lymphadenopathy were 28.6% and 93.5%, respectively. Positive and negative predictive values are 40% and 89.6%, respectively. The tendency shows that specificity reduces if staging or grading increases. The six patients with recurrent bladder cancers had no pelvic lymphadenopathy. The sensitivity and positive predictive value of CT scan on this group could not be calculated, while the specificity and negative predictive value were both 100%. According to preliminary results, it is suggested that CT is not appropriate for detecting of pelvic lymphadenopathy of recurrent bladder cancer.