Monarch Disease Ontology identifier MONDO_0004685 (Waldeyer's ring cancer) is a malignant neoplasm involving the tonsillar ring. Also known as: Waldeyer ring cancer, cancer of tonsillar ring, malignant neoplasm of Waldeyer's ring, malignant neoplasm of tonsillar ring, malignant tonsillar ring neoplasm, malignant tumor of Waldeyer's ring, malignant tumour of Waldeyer's ring, tonsillar ring cancer.