RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A lymph node carcinoma that is characterized by a distinctive pattern in which abnormal nests or cords of epithelial cells surround and/or infiltrate ducts or glandular structures of the lymph nodes. These structures are typically filled with a mucous-like material or contain abnormal fibrous membranes. (DO)