Paraneoplastic panel positive for calcium channel antibody. There is persistent T2 hyperintensity of the bilateral hippocampi, with minimal or no associated swelling. There is also an unchanged punctate focus of T2 hyperintensity in the right frontal centrum semiovale. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There is no abnormal intracranial enhancement. 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, orbits, and scalp soft tissues are unremarkable. There are bilateral maxillary sinus retention cysts.
Persistent T2 hyperintensity in the bilateral hippocampi, which is compatible with paraneoplastic calcium channel antibody limbic encephalitis.