 BRAIN: There are posttreatment findings related to prior embolization and radiosurgery of a left hippocampal / thalamic arteriovenous malformation that appears to be fed by the left posterior cerebral artery. There is persistent T1 hyperintensity and susceptibility effect within the lesion compatible with blood products. There is however decreased surrounding T2 hyperintensity within the left hippocampus and posterior thalamus compatible with decreasing edema. There is no evidence of acute infarct. 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 mild paranasal sinus mucosal thickening.MRA HEAD: There is unchanged flow related signal within the lesion arising 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.
Decreased edema surrounding the treated left hippocampal / thalamic arteriovenous malformation that appears otherwise unchanged.