18F-FDG PET/CT Imaging Findings in Adult-Onset Rasmussen Encephalitis

Abstract Rasmussen encephalitis is a rare condition characterized by chronic, progressive encephalitis. Typically, it involves one cerebral hemisphere and manifests through intractable epileptic seizures. Its occurrence in adults is notably infrequent. In this case, we presented the observations from an 18 F-FDG PET/CT scan of a 70-year-old man diagnosed with Rasmussen encephalitis, where MRI displayed nonspecific findings.