A prospective diagnostic study

Colonoscopy is the gold standard to detect colorectal neoplasm. There have been multiple attempts to improve diagnostic accuracy partly by image improvement and one of them is narrow band imaging (NBI). Based on published reports that NBI have the good diagnostic accuracy, the usage of NBI in differentiating neoplastic and non-neoplastic colorectal lesions was carried out in our center. To explore the diagnostic validity of NBI colonoscopy as well as associated factors related to the neoplastic and non-neoplastic colorectal lesions. One hundred of patients came mainly for screening colonoscopy with variable lower gastrointestinal symptoms that have suspicious colorectal lesions was included in this study. Only one of the most suspicious lesions in each patient (n=100) was analyzed using NBI colonoscopy based on Sano's classification.