A 78-year-old man was admitted to our institution complaining of hematochezia. Colonoscopy showed flat-elevated lesion with a central depression in the lower rectum (Fig.1a). Magnifying endoscopic findings with narrow-band imaging (M-NBI) in the right edge of the lesion showed that the vessel pattern is obscure because of white opaque substance (WOS)(Fig.1b).

中文翻译：

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NBI结肠镜下的WOS可能会阻碍结直肠肿瘤的微血管模式识别

一名 78 岁男性因便血入院。结肠镜检查显示平坦抬高的病灶，下直肠中央凹陷（图 1a）。病灶右边缘窄带成像（M-NBI）放大内镜检查结果显示，由于白色不透明物质（WOS），血管模式模糊（图1b）。