A 74-year-old female visited our clinic with positive fecal occult blood test. Barium enema and endoscopic examination revealed a lesion with type IIa＋IIc about 15mm in size at the sigmoid colon. Left hemicolectomy was performed with diagnosis of early colonic cancer. Macroscopic finding of the resected specimen was classified by a pathologist as a lesion type Is＋IIc. Histologically, moderately differentiated adenocarcinoma was found.
The Is part of the lesion was formed with the expansive invasion of carcinoma mainly in the submucosal layer. There have been a little discrepancy between the radiological/endoscopic and morphological findings. This case was an example suggesting a little philosophical complicity in classifying the macroscopical type of colorectal cancer.
