T4N0 nasopharynx adenoid cystic carcinoma status post chemoradiation. There is no significant interval change in the infiltrative mass within the left nasopharynx, left parapharyngeal, left carotid, left prevertebral spaces, with infiltration of the left central skull base and probable perineural extension into the left Vidian canal. There is minimal residual epidural enhancement along posterior aspect of the left petrous apex. There are mild persistent sinonasal inflammatory changes. There is no significant cervical lymphadenopathy. The thyroid and salivary glands appear unchanged. There is persistent fluid within the left mastoid air cells and middle ear. The orbits are unremarkable.
1. No significant interval change in the adenoid cystic carcinoma centered in the left nasopharynx with adjacent deep space and skull base extension.2. Persistent findings associated with left Eustachian tube dysfunction, as manifested by retained otomastoid secretions.