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Oncology-Clinical Diagnosis: Solid TumorsClinical Diagnosis-Solid Tumors Posters |
1 Nuclear Medicine, Chonnam National University Hospital, Gwang-ju, South Korea
1570
Objectives: The purpose of this study was to investigate the role of PET/CT in the detection of locally recurrent bladder cancer using diuretics and bladder catherization to remove the excreted F-18 FDG from the bladder.
Methods: Thirteen patients with bladder cancer (mean age : 68±10 y, 10 males) underwent PET/CT for recurrence detection. All patients had been previously submitted to primary tumor resection by transurethral resection. Histopathology confirmed transitional cell carcinoma in all cases. Diuretics (20mg of furosemide) was injected intravenously 20 min after F-18 FDG injection. Bladder catherization were performed before image acquisition. PET/CT findings were confirmed by MRI, cystoscopy, or biopsy.
Results: In PET/CT using diuretics and bladder catherization, normal bladder wall activity was similar to pelvic muscle. Hypermetabolic lesions could be easily detected by PET and precisely localized in the bladder wall. PET/CT was able to detect hypermetabolic bladder lesions in 7 of 13 patients. Recurrences were confirmed by cystoscopic biopsy (4 of 7), radical cystectomy (1 of 7) and MRI study (2 of 7). In 6 of 13 patients, bladder wall activity was similar to pelvic muscle. Cystoscopy and MRI were performed in 6 patients. Small papillary mass was found in 1 of 6 patient and was confirmed locally recurrent bladder cancer. PET/CT using diuretics and bladder catherization was showed sensitivity 87.5%, specificity 100%, accuracy 92.3% and false negative rate 12.5%.
Conclusions: PET/CT images after diuretics and bladder catherization were able to overcome the difficulties posed by the urinary excretion of F-18 FDG. PET/CT with diuretics and bladder catherization can be used for detection of locally recurrent bladder cancer.
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