Yuji Inoue

6963 Clinicopathological study of superficial depressed type (type iic) of early colorectal cancer.

Twenty patients who showed superficial depressive type (type IIc) of early colorectal cancer were studied clinicopathologically. All patients were male with a mean age of 67 years. The chief complain was most frequent with positive fecal occult blood in 6 patients, and the type IIc lesion was pointed out by colonoscopy in all patients,. The tumor location was most frequent in transverse colon in 8 patients, and 16 of 20 patients (80%) in the right colon (cecum, ascending colon and transverse colon). The average size of the tumor was 11.3mm in diameter. On colonoscopy, the redness and the deformity of fold was seen in 16 patients (80%) and the conversing fold was in 2. Eleven patients had mucosal cancer and 9 patients had submucosal invasive cancer, and 1 patient had submucosal invasive cancer with lymph node metastasis. No recurrence was occurred in all patients after treatments. Seventeen of 20 patients (85%) had adenoma and 8 patients (40%) had the other colorectal adenocarcinoma. In conclusion, careful observation on colonoscopy are needed to detect type IIc lesion of which findings are reddening and deformities of the folds. The prognosis of type IIc of early colorectal cancer was favorable because the lymph nodes metastasis were seen in 1 patient and because no recurrence was occurred in all patients.