Clinical Study On Narrow-band Imaging In The Diagnosis Of Colorectal Neoplasm

Objective: To assess the value of narrow-band imaging (NBI)endoscopy without high magnification in diagnosis of colorectalneoplasm and non-neoplasm.Methods: Endoscopy with NBI was performed in107patients withcolorectal neoplasm or polypoid lesions. White light endoscopy and NBIendoscopy were performed for each lesion. The diagnosis of endoscopywas made based on the pit pattern or capillary pattern of the lesion. Eachlesion was investigated by pathological examination. The diagnosis ofwhite light endoscopy and NBI endoscopy was compared with that ofhistopathology.Results:①A total of171lesions were found in107patients. NBIendoscopy could show the pit pattern more clearly than white lightendoscopy（χ2=14.346，P=0.006） and also show the capillary clearly;②Diagnostic accuracy was77.19%with white light endoscopy,90.06%with NBI Kudo pattern and89.50%(χ2=14.623,P=0.001）。;③NBIKudo pattern and NBI Sano pattern performed better than white lightendoscopy in diagnosing sensitivity(83.75%、92.13%、91.20%);④ Specificity was71.43%with white light endoscopy,87.80%with NBIKudo pattern and87.30%（χ~2=10.167，,P=0.006）.Conclusions:①Compared with white light endoscopy, NBIendoscopy without high magnification can better observe the colorectalmucosal surface structure and capillary pattern;②It is an effectivemethod for diagnosis of colorectal neoplasm using NBI endoscopywithout high magnification, which may reduce the possibility of misseddiagnosis than white light endoscopy.