400 Background: Narrow Band Imaging (NBI) is a new technique of urethrocystoscopy, in which only a certain bandwidths of illumination (415 (blue) and 540nm (green)) of the spectrum is used to detect urothelial carcinoma. The aim of the investigation was to analyse the potential benefit of NBI in the follow up of patients with transitional cell carcinoma of the bladder. Methods: In the time between August 2013 until August 2014, patients with history of transitional cell carcinoma of the bladder, who presented for follow-up cystoscopy , were either examined via flexible white light endoscopy [WLE] plus second look WLE (n = 317, controls) or second look NBI-cystoscopy alone (n = 308) in the same session. Results: Rates of recurrences were similiar in both groups (NBI 95 (25%); WLE 85 (26.8%)). NBI after WLE identified more tumours in 21 patients (6.1 vs. 3.81). In 9 patients NBI showed no vascularization in suspicious areas. In the control arm, in 9 cases more tumours (4,67 vs. 3.33) were identified in the second WLE. After macroscopical identification of a recurrence, the time since the last resection was measured (WLE 10,67 months, NBI 16,85 months). Conclusions: While the number of patients with recurrent bladder cancer is not influenced by the use of NBI, the additional use of NBI in the follow-up cystoscopy of patients after transurethral resection of superficial bladder cancer (TUR) leads to an increased number of detected tumors. A part of the additionally detected tumors can be explained by the double examination. In addition NBI appears to provide a hint in individual cases whether a TUR is necessary at all.