rectal neoplasm (MONDO_0002165) is a benign or malignant neoplasm that affects the rectum. Representative examples of benign neoplasms include lipoma and leiomyoma. Representative examples of malignant neoplasms include carcinoma, lymphoma, and sarcoma. Rectal adenomas always exhibit epithelial dysplasia and are considered premalignant neoplasms. Also known as: neoplasm of rectum, neoplasm of the rectum, rectal tumor, rectal tumour, rectum neoplasm, rectum neoplasm (disease), rectum tumor, rectum tumour.