Monarch Disease Ontology id MONDO_0002368 (papillary serous cystadenocarcinoma) is a malignant cystic serous epithelial neoplasm characterized by the presence of malignant glandular epithelial cells forming papillary structures. Stromal invasion is present. Also known as: papillary serous adenocarcinoma, serous surface papillary carcinoma (morphologic abnormality).