A malignant neoplasm involving the ascending colon. The disease is Monarch Disease Ontology id MONDO_0002238 (ascending colon cancer). Also known as: Ca ascending colon, cancer of ascending colon, malignant ascending colon neoplasm, malignant neoplasm of ascending colon, malignant neoplasm of right colon, malignant tumor of ascending colon, malignant tumour of ascending colon.