Pit pattern type analyses of colon polyps with high-resolution colonoscope

Background/Aims: Correlations among pit pattern types and some characteristics of colon polyps were assessed with high-resolution colonoscope in Turkish patients. Methodology: Sixty-five patients were included in the study. All visible polyps and distal 30cm of colon were stained with indigo carmine 0.4% after standard colonoscopic examination. Then, pit pattern analyses were done. Correlations were evaluated and results were interpreted as significant if p<0.05. Results: There were correlations among the pit pattern types of polyps and their size, location, morphology and histology. Adenomatous polyps (type III,IV,V) were mostly located in the right colon, non-adenomatous polyps (type I/II) were mostly in the left. Ratio of having adenomatous structure increased in a parallel course with increase in polyp's size. While most of the nonadenomatous polyps were with type 1,11, adenomatous polyps were with type III,IV,V patterns. Most of the type II,III,IV polyps were sessile and type I polyps were flat. Sensitivity and specificity of adenomatous and nonadenomatous polyps were 80% and 89% respectively and overall accuracy rate was 87%. Type III/IV were the best estimated type among the others. After chromoendoscopy, 35% increase in polyp number was also detected. Conclusions: High-resolution endoscope is successful for prediction of histology of colorectal polyps.