[Narrow band imaging for detection of non-polypoid colorectal neoplasms].

Non-polypoid (flat and depressed) colorectal neoplasms (NP-CRNs) are more difficult to detect by conventional white light colonoscopy (WLC) or computed tomography colonography, because the subtle findings can be difficult to distinguish from those of normal mucosa. Narrow band imaging (NBI) has been reported to highlight the mucosal capillaries of neoplastic lesions, and thus increase the detection rate of colon polyps, however, the detection rate of NP-CRNs, especially depressed in shape, has not been assessed yet.