Monarch Disease Ontology id MONDO_0000920 (duodenum cancer) is a primary or metastatic malignant neoplasm that affects the duodenum. Representative examples include carcinoma, lymphoma, and sarcoma. Also known as: cancer of duodenum, duodenal cancer, malignant duodenal neoplasm, malignant duodenal tumor, malignant duodenal tumour, malignant duodenum neoplasm, malignant neoplasm of duodenum, malignant neoplasm of the duodenum.