Monarch Disease Ontology id MONDO_0002703 (appendix mucinous cystadenocarcinoma) is an adenocarcinoma arising from the appendix, characterized by the presence of mucinous stroma formation and cystic structures. Also known as: appendiceal colloid cystadenocarcinoma, appendiceal colloidal cystadenocarcinoma, appendiceal mucinous cystadenocarcinoma, appendix colloid cystadenocarcinoma, appendix colloidal cystadenocarcinoma, colloid cystadenocarcinoma of appendix, colloid cystadenocarcinoma of the appendix, colloidal cystadenocarcinoma of appendix.