mucinous adenocarcinoma (Monarch Disease Ontology identifier MONDO_0004957) is an invasive adenocarcinoma composed of malignant glandular cells which contain intracytoplasmic mucin. Often, the infiltrating glandular structures are associated with mucoid stromal formation. It may arise from the large and small intestine, appendix, stomach, lung, ovary, breast, corpus uteri, cervix, vagina, and salivary gland. Also known as: adenocarcinoma, mucinous, malignant, colloid adenocarcinoma, colloid carcinoma, gelatinous adenocarcinoma, gelatinous carcinoma, mucin-producing adenocarcinoma, mucin-producing adenocarcinoma (morphologic abnormality), mucin-secreting adenocarcinoma.