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目的探讨通过染色放大内镜观察大肠息肉腺体开口的特点,评估其肿瘤性息肉及非肿瘤性息肉的准确性.方法采用染色放大内镜观察息肉pit开口特点与病理结果进行比较.结果放大内镜结合染色内镜对非肿瘤病变诊断的准确率是89.47﹪,对诊断为肿瘤病变的准确率是95.16﹪,,整体准确率是84.21﹪.结论放大内镜对肠道息肉的定性诊断是可靠的.“,”Objectives To investigate the features of pit patterns by magnifying endoscopy on colorectal lesions especialy neoplastic lesions and nonneoplastic lesion and the relationship between pit pattern and evaluate the accuracy of diagnosing neoplastic and nonneoplastic colorectal lesions by magnifying endoscopy. Methods The pit patterns of lesions observed by magnifying endoscopy were compared with pathological results. Results The diagnostic accuracy of nonneoplastic lesions by magnifying endoscopy was 89.47﹪ and 95.16﹪ to neoplastic lesions, the overal accuracy were 84.21﹪. Conclusions Magnifying endoscopy can wel distinguish nonneoplastic lesions from neoplastic lesions. Most ⅤA pit pattern correspond to intramucosal carcinoma and it may be submucosa carcinoma or advanced carcinoma whenⅤN pit pattern appeared. The images of pit pattern obtained by magnifying endoscopy are similar to those provided by stereomicroscopy.