In a very recent tandem study in which white light endoscopy was compared with NBI in 48 patients with longstanding UC there was no additional benefit of NBI. In the 25 patients who were first endoscoped with white light 8 dysplastic lesions were found. After NBI imaging another 7 lesions were found. In the 23 patients which were first imaged with NBI 7 lesions were found and an additional 8 after white light endoscopy (Van den Broek FJ et al 2011.