 BRAIN: Again seen are posttreatment findings related to prior embolization and radiosurgery of a left hippocampal/thalamic/lateral ventricle arteriovenous malformation that appears to be fed by the left posterior cerebral artery. There is no significant change in T1 hyperintensity which may related to calcification. There is slight decrease in surrounding T2 hyperintensity/edema within the left hippocampus and posterior thalamus compared to 5/20/2015 and more clear decrease when compared to 3/5/2015. There is no evidence of acute infarct or acute hemorrhage. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The skull and scalp soft tissues are unremarkable. There is minimal paranasal sinus mucosal thickening.MRA HEAD: There is unchanged flow-related signal within the AVM fed from the left posterior cerebral artery. The intracranial internal carotid arteries are normal in course and caliber. The middle and anterior cerebral arteries are unremarkable. The vertebral arteries, basilar artery, and posterior cerebral arteries are otherwise normal in course and caliber. There is no evidence of flow-limiting stenosis.
No significant change in size of left hippocampal/lateral ventricle/thalamic AVM compared to 5/20/2015, but smaller compared to remote study from 10/30/2014. There is minimal interval decrease in edema compared to most recent prior and more significant decrease in edema compared to 3/5/2015. No hydrocephalus. No new hemorrhage or mass effect.