Objective To evaluate the efficacy of i-scan endoscopy in detecting small colorectal precancerous lesions.Methods A total of 127 patients were randomized into 2 groups to underwent conventional colonoscopy and i-scan endoscopy respectively.The findings were compared with pathologic examinations.Results A total of 84 lesions were detected by conventional endoscopy in 64 patients,while 147 lesions were found in 63 patients with high resolution detection only,which was increased to 259 with i-scan,including 102 flat lesions.With respect to histology,adenomatous lesions could be predicted with a high sensitivity (80％) and a high specificity ( 100％ ) by i-scan endoscopy.Conclusion More small colorectal lesions can be detected by i-scan endoscopy,which can distinguish neoplasm from non-neoplasm colorectal lesions.

ObjectiveTo evaluate digital chrome endoscopy (I-Scan) and confocal laser endomicroscopy (CLE) for diagnosis of Barrett esophagus (BE).MethodsFrom July 2010 to July 2011,a total of 878 outpatients who had upper gastrointestinal symptoms underwent routine endoscopy and I-Scan examination,screened patients with suspected Barrett's epithelial were further referred to CLE and endoscopy.The detection rate and image features of BE between routine endoscopy and I-Scan,and the diagnosis of BE between pathology and CLE,were compared respectively.ResultsSuspected BE was diagnosed in 46 patients (5.2％) by routine endoscopy,and in52 (5.9％) by I-Scan,and there was no significant difference in detection rate between 2 methods (x2 =0.533,P ＞ 0.05 ).The detection rate of paliform blood vessels between SCJ and GEJ was higher using I-Scan (35/52,67.3％ ) than routine endoscope (21/46,45.7％,P ＜0.05).A total of 19 suspected BE underwent CLE and biopsy,and BE was diagnosed by CLE with a sensitivity of 93％ and a specificity of 100％.ConclusionI-Scan is capable of identifying paliform blood vessels between SCJ and GEJ,and can improve the detection rate of suspected BE.CLE is able to provide in-vivo histological diagnosis of BE with a high sensitivity and specificity.