Inclusion Criteria:  female and male patients recurrent bladder tumor preoperative cystoscopy CT or MRI scan of abdomen not older than 30 days prior to surgery without suspicion of advanced disease (MIBC, metastasis) max. non-invasive papillary tumor (pTa) staging in prior histology max. low grade grading in prior histology max. 5 lesions in actual cystoscopy (all < 3cm) exophytic tumors transitional cell cancer of urinary bladder patient able to give consent signed consent form  Exclusion Criteria:  initial tumor flat lesion > 3cm carcinoma in situ (CIS) in prior histology or suspicious CIS-finding in actual cystoscopy high grade grading in prior histology ≥ pT1 (tumor infiltration into subepithelial connective tissue) staging in prior histology > 5 lesions different entity from transitional cell carcinoma of urinary bladder prior radiation emergency surgery prior indwelling catheter (extraction < 1 week prior to surgery) pregnancy orthotopic neobladder