Schwannoma
Discussion: A wide differential diagnosis can be generated with this nonspecific process. The differential diagnosis includes a minor salivary gland tumor, extranodal lymphoma, plasmacytoma, sarcoma, hemangiopericytoma and tumors of neurogenic origin. There are no imaging findings which specifically lead one to the diagnosis of a tumor of neurogenic origin. 15 to 20% of parapharyngeal space masses have a neurogenic origin although minor salivary gland tumors are still the most common.