anus neoplasm (MONDO_0003046) is a benign or malignant neoplasm that affects the anal canal or anal margin. Representative examples of benign neoplasms include squamous papilloma and papillary hidradenoma. Representative examples of malignant neoplasms include carcinoma, lymphoma, and melanoma. Also known as: anal neoplasm, anal neoplasms, benign and malignant, anal tumor, anal tumors, anal tumour, anal tumours, anus neoplasm (disease), anus tumor.