Monarch Disease Ontology term MONDO_0002722 (olfactory nerve neoplasm) is benign and malignant neoplasms which arise from or metastasize to the olfactory or first cranial nerve. Clinical features may include facial pain and impairments of taste or smell. Also known as: cranial nerve I neoplasms, first cranial nerve neoplasm, first cranial nerve neoplasms, first cranial nerve tumor, first cranial nerve tumour, neoplasm of first cranial nerve, neoplasm of olfactory nerve, neoplasm of the first cranial nerve.