Previous data shows that colorectal serrated lesions are precursor of carcinogenesis. It has been advancing even molecular biological analysis, SSA/P become microsatellite instability (MSI) positive colon cancers and TSA become microsatellite stable (MSS) positive colon cancers. It is observed that redness and double elevation in conventional endoscopy, CP type II (Sano classification) in the NBI endoscopy, type III pit pattern in magnifying endoscopy, if SSA/P have cytological dysplastic change. Especially, if SSA/P have cancerous change, CP type III and type V pit pattern are observed.