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Catatonia is one of the main symptoms of anti-N-Methyl-D-aspartate receptor (NMDAR) encephalitis. However, it is unknown whether metabolic changes observed with (18)F-Fluorodeoxyglucose positron-emission tomography (FDG-PET) are correlated with the severity of the catatonic symptoms and clinical course. Three patients with anti-NMDAR encephalitis showing variable degrees of catatonia were performed with FDG-PET scans during the acute and recovery phase. PET findings showed hypermetabolism in the frontotemporoparietal regions and bilateral basal ganglia in the patient with mild catatonia, but more widespread hypermetabolic regions including the thalamus and brainstem were observed in the patients with more severe catatonia. Follow-up PET scans in one patient showed mild hypermetabolism in the right basal ganglia that correlated with mild rigidity and tonic posturing in the left extremities. Extent of cerebral metabolic changes correlates with the severity of catatonia accompanied by behavioural, motor, autonomic, and breathing abnormalities in anti-NMDAR encephalitis.

journal of epilepsy research

18F-Fluorodeoxyglucose Positron-Emission Tomography Findings with Anti-N-Methyl-D-Aspartate Receptor Encephalitis that Showed Variable Degrees of Catatonia: Three Cases Report