label: Rectosigmoid Carcinoma
label_lc: rectosigmoid carcinoma
description: A malignant epithelial neoplasm that arises from the rectosigmoid area and invades through the muscularis mucosa into the submucosa.  The vast majority are adenocarcinomas.  About 50% of colorectal carcinomas occur in the rectosigmoid area.