What is the definition or description of: mucinous carcinoma?

Colloid carcinoma: Clusters of small uniform cells floating in lakes of extracellular mucin. Usually older women (mean age 71 years) slow growing breast cancer.

Type of cancer: Mucinous carcinoma is a type of adenocarcinoma (a malignant tumor arising from glands) in which abundant mucin is present. Mucin is a protein produced by certain types of epithelial tissues. Mucinous carcinomas, also called colloid carcinomas, can be found in a variety of organs, including breast, lung, and colon. Depending on the organ, a mucinous carcinoma may have a different prognosis.