The appendiceal mucocele is a rare disorder, usually found incidentally during ultrasonography or radiologic studies. Mucoceles of the appendix include benign or malignant disease. Both of benign cystadenoma and malignant cystadenocarcinoma are characterized by an obstructed, mucin-filled appendix displacing the cecum. We experienced a case of partial obstruction of large bowel who had a cystadenoma at appendix and a colon cancer at other site on operation field. Here in, we report a case of appendiceal mucocele and concominant colon cancer with the review of literatures.