Olfactory Neuroblastoma Presenting as a Submandibular Mass

Background: Olfactory Neuroblastoma is a rare, locally aggressive malignant neoplasm arising from the olfactory epithelium, which causes metastasis by lymphatic and haematogenous routes, with most common site being the cervical lymph nodes. Materials and Methods: Clinical history was retrieved from discussion in the Head and Neck multidisciplinary team meeting and medical records. Routine macroscopic and microscopic histological examination along with appropriate immunohistochemistry was performed. In addition, we include the review of literature of olfactory neuroblastoma metastatic to different sites. Results: A 75 year old female presented with a left submandibular mass which on biopsy was diagnosed as high grade neuroendocrine carcinoma requiring further investigation for characterising it as primary or metastatic. The histological diagnosis proved difficult and doubtful, till after five months when on follow up investigation a skull base lesion was identified, this on biopsy was confirmed to be an olfactory neuroblastoma. Conclusion: It is important to think laterally and consider metastatic tumours when evaluating neuroendocrine lesions in the submandibular region as this can be the first manifestation.