Acinic cell carcinoma of the right parotid gland, metastatic to the skull base, status post treatment. There are postoperative findings related to right parotidectomy and mastoidectomy, which are partially imaged. There is no significant interval change in the extent of the ill-defined heterogeneously enhancing mass that involves the right basiocciput, petrous ridge, and condylar and squamous portions of the occipital bone. The central areas of non-enhancement within the mass likely represent necrosis and are not significantly changed. The mass still abuts the right internal carotid artery and encases the right internal jugular vein. There is also unchanged abnormal enhancement within the lateral mass of the C1 vertebra. There is fluid and enhancement within the right mastoid air cells. There is no evidence of intracranial hemorrhage or acute infarct. There is no mass effect upon the cerebellum or brainstem. There are a few nonspecific foci of T2 hyperintensity in the cerebral white matter. The ventricles and basal cisterns are unchanged in size and configuration. There is no midline shift or herniation. The orbits are unremarkable. The remaining salivary glands are unremarkable.
No significant interval change in the treated acinic cell carcinoma metastasis involving the right lateral skull base and craniocervical junction, perhaps superimposed upon osteonecrosis.