| [ Summary ] |
The natural history of colorectal cancers less than 2cm in diameter was investigated primarily by using BE film. The following estimations were made; Nodular, sessile elevated and superficial elevated (type IIa) lesions are important types of early lesions (6mm or greater in size) is respect to small advanced cancers. Furthermore, it is also highly probable that sessile lesions, associated with the following findings, develop into small advanced colorectal cancers: 1) converging folds, 2) submucosal tumor-like structures, 3) central depressions, and 4) solid nodular lesions with smooth surfaces. |