Monarch Disease Ontology identifier MONDO_0004251 (small intestine neoplasm) is a benign or malignant neoplasm that affects the small intestine. Representative examples of benign neoplasms include lipoma and leiomyoma. Representative examples of malignant neoplasms include carcinoma, lymphoma, and sarcoma. Also known as: neoplasm of small bowel, neoplasm of small intestine, neoplasm of the small bowel, neoplasm of the small intestine, small bowel neoplasm, small bowel tumor, small bowel tumour, small intestinal neoplasm.