Abstract
The Authors examined 5620 colorectal tumorous lesions via magnifying endoscopy, stereomicroscopy and histopathology. Lesions with type I or II pit pattern are nontumors, whereas lesions with types IIIs, IIIL, IV and/or V pit pattern are tumors. Their magnifying endoscopic pit patterns images were fundamentally similar to the stereomicroscopic images. The accuracy of endoscopic diagnosis, or magnifying endoscopic diagnosis consistent with histological diagnosis, was 95.2% (5351/5620 lesions). Lesions exhibiting type VN or VI-s pit pattern with bounded surface are cancers invading the submucosal layer. If this pit pattern ranges extensively, sm-massive is strongly suspected. Polypectomy or endoscopic mucosal resection is not indicated for these lesions in view of invasive character.
