Vestibular schwannoma 6 months surveillance. There are postoperative findings related to left retrosigmoid craniotomy. There is persistent intermediate T2 and enhancement within the left internal auditory canal, measuring up to approximately 1 cm in length. There is no evidence of acute infarct. The ventricles and basal cisterns are unchanged in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. There is a left maxillary sinus retention cyst.
Postoperative findings related to left retrosigmoid craniotomy with persistent intermediate T2 and enhancement within the left internal auditory canal, measuring up to approximately 1 cm in length, which may represent a combination of tumor and treatment effects. 