Monarch Disease Ontology entry MONDO_0002638 (glossopharyngeal nerve neoplasm) is a neoplasm involving a glossopharyngeal nerve. Also known as: IXth cranial nerve neoplasms, IXth cranial nerve tumors, IXth cranial nerve tumours, Ninth cranial nerve neoplasm, Ninth cranial nerve neoplasms, Ninth cranial nerve tumor, Ninth cranial nerve tumors, Ninth cranial nerve tumour.