Right cerebellopontine angle mass, likely meningioma: vertigo. Internal Auditory Canals: There is a lobulated, partially enhancing, T2 hypointense mass that appears to be dural based in the right cerebellopontine angle cistern with slight extension into the right internal auditory canal, which measures up to approximately 9 mm. There is mass effect upon the right cranial nerve 7 and 8 complex, but no mass effect upon the pons. The left bilateral cranial nerve 7 and 8 complex are intact. The bilateral inner ear structures, including the cochlea, vestibule, endolymphatic duct, and semicircular canals, appear unremarkable. The bilateral mastoid air cells and middle ears also appear unremarkable.Brain: There is no evidence of intracranial hemorrhage or acute infarct. The brain parenchyma appears unremarkable. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
An unchanged subcentimeter mass in the right cerebellopontine angle cistern with slight extension into the right internal auditory canal, which appears to be dural based, may represent a meningioma.