目的 观察18F-FDG PET/CT盆部延迟显像在原发性膀胱癌的诊断和局部分期中的价值。方法 27例疑似膀胱癌患者，术前均行增强CT及18F-FDG PET/CT常规加盆部延迟显像进行诊断和分期，以手术病理结果作为金标准，观察盆部延迟显像在原发性膀胱癌诊断和局部分期上的价值，并与增强CT作比较。结果 27例患者中，增强CT、盆部延迟显像诊断原发肿瘤的灵敏度分别为77.27%、90.90%；特异度分别为60.00%、40.00%；准确度分别为74.07%、81.48%；盆部延迟显像和增强CT诊断准确度比较无统计学差异（P=0.263）。12例患者接受了膀胱癌根治术，其中10例有盆腔淋巴结或邻近组织转移，增强CT、盆部延迟显像局部分期准确度分别为33.33%、91.67%，盆部延迟显像优于增强CT（P=0.018）。结论 18F-FDG PET/CT盆部延迟显像在原发性膀胱癌的诊断上与增强CT具有同等价值，局部分期准确度优于增强CT，具有更高的临床价值。

Objective To evaluate the potential ability of 18F-FDG PET/CT delayed imaging of pelvis for detection and locoregional staging of urinary bladder tumors. Methods Twenty-seven patients suspected with primary carcinoma of the urinary bladder were evaluated prospectively for diagnosis and staging. The patients underwent conventional contrast-enhanced computed tomography (CECT) of the pelvis and whole-body 18F-FDG PET/CT. In addition, delayed pelvic PET/CT images were obtained after oral hydration. Results of CECT and 18F-FDG PET/CT were compared considering histopathology as a reference standard to evaluate the value of delayed pelvic PET/CT images in detection and locoregional staging of urinary bladder tumors. Results Of the 27 patients, the sensitivity of CECT and delayed pelvic PET/CT was 77.27% and 90.90% respectively; the specificity was 60.00% and 40.00% respectively; and the accuracy rate was 74.07% and 81.48% respectively. The accuracy rate of delayed pelvic PET/CT imaging and CECT had no statistical difference (P=0.263). Twelve patients underwent radical cystectomy, ten had locoregional metastases. The accuracy rate in locoregional staging of CECT and delayed PET/CT was 33.33% and 91.67%, respectively. Delayed PET/CT was superior to CECT (P=0.018). Conclusion 18F-FDG PET/CT delayed imaging of pelvis has a good sensitivity and accuracy rate in detection of urinary bladder cancer as good as CECT, and might be more better in locoregional staging of urinary bladder cancer.