 Susceptibility with corresponding areas of T2 hypointensity is again visualized in the basal cisterns symmetrically and along scattered bilateral supratentorial and infratentorial subarachnoid spaces, more prominent along the left greater than right occipital lobes, right temporal lobe, left parietal lobe, right greater than left sylvian fissure, and cerebellar sulci outlining the folia, especially along the superior vermis. There is also prominent susceptibility in the fourth ventricular outflow. Accounting for differences in technique between the T2* at 3T on this exam and GRE on the previous OSH exam, there is no significant change. Findings are more conspicuous on the current SWI images. There is no associated abnormality identified.The ventricles and sulci are normal in size. There are no masses, mass effect or midline shift. No diffusion-weighted abnormalities are identified. There is no abnormal enhancement within the brain.
Superficial hemosiderosis of the basal cisterns and scattered supratentorial and infratentorial subarachnoid spaces appearing similar to the prior exam accounting for differences in technique, more apparent on SWI images. No causative abnormality identified.