Left trigeminal nerve deficits. Face: There is a predominantly T2 intermediate, enhancing, relatively well-defined, mildly lobulated mass with low diffusivity within the left masticator space, centered around the posterior mandible, which appears to have cortical erosions medially. The mass measures up to 48 mm and surrounds the proximal left inferior alveolar nerve. The mass contains a cystic area laterally with fluid-fluid level that is suggestive of hemorrhage. The mass contributes minimally to oropharyngeal airway narrowing. There is mild posterior deviation and narrowing of the left internal jugular vein. The left internal carotid artery flow void appears to be intact. There is no convincing evidence of significant regional lymphadenopathy. There is no evidence of intracranial extension. Aside from mass effect upon the left parotid gland, the salivary glands are intact. Internal Auditory Canals: The bilateral cranial nerve 7 and 8 complexes are intact. The cisternal segments of the bilateral trigeminal nerves are also intact. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma and pituitary gland appear unremarkable. There is no abnormal intracranial enhancement. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation.
A bulky mass within the left masticator space likely represents a neoplasm such as a sarcoma.