| [ Summary ] |
The pure depressed type of early colorectal cancer (IIc) is a well-demarcated depression, as exemplified by lesions which have a star-like or roundish irregular margin. Depressed type cancer of which the tumorous portion is not elevated and the depressed base is lower than or nearlyequal to the normal mucosa in height, is referred to as type IIc or IIc+IIa. These lesions, even when of minute size, show a high percentage of invasion into the submucosal layer and take a de novo route with a type IIIs or type V pit pattern. For these reasons, it is necessary to find pure IIc type and administer the correct endoscopic treatment clinically. |