 There is an extra-axial enhancing mass arising within the left cerebellopontine angle cistern extending into the internal auditory meatus that measures 13 x 17 x 12 mm, previously 13 x 15 x 11 mm. There is decreased enhancement within the tumor centrally. There is no significant mass effect on the adjacent brainstem. There is no evidence of intracranial hemorrhage or acute infarct. There are no areas of abnormal parenchymal signal. There is no abnormal intraparenchymal enhancement. 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 skull and scalp soft tissues are unremarkable. There is a small mucous retention cyst within the left maxillary sinus. The midline structures and craniocervical junction are within normal limits.
Interval post-treatment effects in the left vestibular schwannoma with perhaps slight increase in size. I personally reviewed the Images and/or procedure with the Resident/Fellow and agree with this report.