Autoimmune encephalitis: increased headache and balance problem. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There appears to be persistent mild asymmetrically high T2 signal in the right hippocampus. The rest of the brain parenchyma appears unremarkable. There is a punctate focus of susceptibility effect and enhancement in the central pons, which likely represents a teleangiectasia. 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 orbits, skull, and scalp soft tissues are grossly unremarkable. There are bilateral maxillary sinus retention cysts, left larger than right.
Apparent persistent mild high T2 signal in the right hippocampus may be related to the autoimmune encephalitis. 