Magnifying Endoscopy for Early Colorectal Cancer

概要

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Pit pattern diagnosis using magnifying chromoendoscopy for colorectal tumors is useful in histologic diagnosis and invasion depth prediction. There are two kinds of chromoendoscopy: that using indigo carmine dye spraying and that using crystal violet staining. However, crystal violet staining can not be used to examine all tumors. When tumors are suspected of type V pit pattern, it is necessary to observe the tumors using crystal violet staining. Especially, the type V<SUB>N</SUB> pit pattern is a useful indicator of submucosal invasion deeper than 1,000 μm. Also, narrow band imaging (NBI) is considered to be useful in differential diagnosis between neoplasia and non-neoplasia & pit pattern diagnosis (surface pattern) for regular pits without chromoendoscopy. NBI magnification is expected to be useful for the qualitative diagnosis of colorectal tumors through assessment of both microvessel structure and surface pattern on the lesion surface.