| [ Summary ] |
The observance of the surface structure of crypts using magnifying chromoendoscopy, through pit pattern classification, has previously been reported to be useful in diagnosing colorectal lesions accurately. In contrast, observation of micro-capillary (MC) vessels using Narrow Band Imaging (NBI) magnification, which requires no application of a dye solution, is also useful to diagnose colorectal lesions. Employing NBI magnification, CP was classified into the following three groups in relation to MC vessels, (1) CP type I : lesions without MC vessels, (2) CP type II : lesions with MC vessels, (3) CP type III : lesions with MC vessels which have lost demarcating formations around crypts, exhibiting complicated winding, stopped and branching irregularly. Furthermore, CP type III was sub-categorized into III A and III B in order to distinguish lesions which have infiltrated into deeper submucosal layers (1,000 μm ≤). The CP type III B was defined as those lesions in which the density of MC vessels is loose in NBI magnifying observation. NBI was the most reliable method to distinguish between non-neoplastic and neoplastic lesions. In contrast, the diagnostic ability of NBI magnifying observation of lesions infiltrating into deeper submucosal layers was inferior in terms of diagnosing pit patterns with dye solution. |