Reported history of AVM, s/p craniotomy, intractable epilepsy. Evaluate postoperative changes. The fluid collections overlying and underlying the left pterional craniotomy flap are resolved. The associated including midline shift and mass effect on the left lateral ventricle have resolved. The dilated superficial veins overlying the left cerebral hemisphere remain unchanged. There is drainage into the superior sagittal sinus and along a dilated cortical vein. There is also dilatation of the inferior sagittal sinus which causes abnormal signal on the T2/FLAIR sequence, but enhances on post-contrast images without any intrinsic T1 hyperintensity. There is polymicrogyria along the posterior aspect of the sylvian fissure which is unchanged. The left cerebral hemisphere is slightly smaller than the right which is also unchanged. There is no significant abnormality of the remainder of the brain. There is no brain parenchymal hemorrhage.
1.Resolution of the extraaxial collection underlying the left pterional craniotomy flap.2.The underlying dilated left superficial cerebral veins remain unchanged, with now dilatation of the inferior sagittal sinus demonstrating associated flow-related artifact. There is no intraparenchymal hemorrhage.3.Left parietal polymicrogyria and associated developmental findings also remain unchanged. 