70-year-old female with history of SRS for arteriovenous malformation in January 2015: one year follow-up. There is an enhancing arteriovenous malformation in the left superior frontal gyrus, which has decreased in size measuring 11 mm x 9 mm x 14 mm, previously 13 mm x 13 mm x 11 mm. There is no associated residual surrounding edema. There is a mildly prominent draining vein extending to the superior sagittal sinus. The left anterior cerebral artery is larger in caliber in comparison with the right, which is unchanged. There is no evidence of flow limiting stenosis. There is a 1 mm wide outpouching along the origin of an anterior temporal branch of the left posterior cerebral artery. There is an unchanged 2 mm thick area of extra-axial enhancement along the left parietal convexity, which may represent a prominent venous complex or meningioma. There are scattered foci of T2 hyperintensity within the subcortical and periventricular cerebral white matter without restricted diffusion. There is no evidence of acute intracranial hemorrhage. The ventricles and sulci are unchanged in appearance and there is no midline shift. There is a small right ethmoid sinus retention cyst. The orbits appear unremarkable.
1. Interval decrease in size of the left superior frontal gyrus arteriovenous malformation, along with interval resolution of the associated surrounding vasogenic edema. 2. A 1 mm wide outpouching along the origin of an anterior temporal branch of the left posterior cerebral artery may represent a aneurysm or prominent infundibulum.3. Chronic small vessel ischemic disease, without evidence of acute infarction. 