Meningioma treated with SRS. There are postoperative findings related to suboccipital craniotomy with extensive left cerebral and to a lesser extent cerebellar vermian and right cerebellar hemisphere encephalomalacia. There is no significant interval change in the mildly enhancing tumor along the medial left tentorium, which extends and likely invades the confluence of the sinuses. The lesion measures approximately up to 20 mm, previously also 20 mm. There are mild scattered nonspecific foci of cerebral white matter T2 hyperintensity, which are likely related to chronic micrangiopathy. There is no evidence of acute infarct. There is diffuse cerebral volume loss, which is perhaps most pronounced in the bilateral medial temporal lobes. The major cerebral artery flow voids are grossly intact. There is a left maxillary sinus retention cyst.
1. Stable post-operative findings without significant interval change in the residual meningioma along the medial left tentorium that extends and likely invades the confluence of the sinuses and measures up to 20 mm. 2. Diffuse cerebral volume loss, which is perhaps most pronounced in the bilateral medial temporal lobes, may represent Alzheimer disease.