消化道肿瘤是日益危害人类健康的疾病 ,提高消化道肿瘤治疗疗效的关键在于早期发现、早期诊断 ,目前内镜检查是诊断消化道早期肿瘤的最重要的方法之一。通过内镜检查不仅能观察病变的部位、形态大小、数目等 ,而且能钳取活组织进行病理诊断。随着内镜诊断技术的提高 ,早期消化 Gastrointestinal cancer is increasingly harmful to human health diseases, improve the efficacy of gastrointestinal cancer treatment is the key to early detection, early diagnosis, endoscopy is the diagnosis of early gastrointestinal cancer is one of the most important methods. Through endoscopy can not only observe the lesion site, shape size, number, etc., but also to clamp the living tissue for pathological diagnosis. With the improvement of endoscopic diagnostic techniques, early digestion