colorectal adenocarcinomaadenocarcinoma colon cancermetastatic colorectal adenocarcinomaadenocarcinoma rectal cancercolorectal mucinous adenocarcinomacolorectal carcinoma pathologyadenocarcinoma colon treatmentmetastatic adenocarcinoma coloncolon adenocarcinoma pathologyrectosigmoid adenocarcinomaintramucosal adenocarcinoma colonadenocarcinoma of descending colon