1992 Volume 34 Issue 4 Pages 888-892_1
Types of early colorectal cancer have been almost protruded one, and typical early colorectal cancers of depressed type have rarely reported. We report here a case of superficially depressed type early colonic cancer. The patient is a 54-year-old man with a chief complaint of diarrhea. A typical IIc type lesion was observed in the descending colon on endoscopic examination. There were no other lesions in the colon and rectum. Endoscopic resection was performed. Using a dissecting microscope, we noticed that the resected specimen showed a diminutive and shallow depressed lesion, measuring 2.5×1.8mm in size. Histological findings showed well differenciated adenocarcinoma limited within the mucosa. No adenomatous component was contained. Therefore, the lesion was proven to be a IIc type "de novo" cancer of the colon. The incidence, histogenesis and developmental process of this type of early colorectal cancer is still unknown. To elucidate these questions, we need more accumulations of depressed type early colorectal cancers. Colonoscopist should be aware that colorectal cancer can exist as a superficially depressed (IIc) lesion.
