[Endoscopic diagnosis of early colon cancer]

Early colon cancer are divided into pedunculated (with constriction) group and broad-based (without stalk) group. The former is more of ten diagnosed, particularly in the earlier cancers (m cancer). However, the possibility that broad-based group may be missed during the endoscopic examination cannot be neglected. Colonoscopy should be performed with scrupulous care not to miss small broad-based lesions. They are frequent in the rectum and the right-sided colon. Flat or depressed type of early cancers have come to be diagnosed owing to the effort of colonoscopist and the improvement of the scope. Particularly, the introduction of TV scopes into the field of colonoscopy has accelerate the trend.