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Rationale: Anti-alpha-amino-3-hydroxy-5-methyl-4-isozolipropionic acid receptor (AMPAR) encephalitis is a rare autoimmune encephalitis mediated by anti-AMPAR antibodies produced on the surface of neuronal cells. Anti-AMPAR encephalitis has a variety of clinical manifestations, the common clinical manifestations are characterized by borderline encephalitis, including short-term memory loss, confusion, behavioral abnormalities, and seizures.
Patient Concerns: Here we report a case of anti-AMPAR encephalitis in an adolescent female with aphasia as the first symptom of involuntary limb shaking.
Diagnoses: The diagnosis of anti-AMPAR encephalitis is based on clinical symptoms and further detection of serum antibodies.
Interventions And Outcomes: The patient responded well to intravenous methylprednisolone combined with immunoglobulin treatment, and her limbs no longer shook and her speech was fluent.
Lessons: Early diagnosis of autoimmune encephalitis is challenging due to the heterogeneity of clinical manifestations. Our patient was initially diagnosed with involuntary limb movement, so we should conduct further research on symptoms associated with autoimmune encephalitis.
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http://dx.doi.org/10.1097/MD.0000000000042036 | DOI Listing |
Front Hum Neurosci
July 2025
Department of Neurology, Shandong Provincial Qianfoshan Hospital, The First Affiliated Hospital of Shandong First Medical University, Jinan, Shandong, China.
Anti-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor encephalitis is a rare autoimmune encephalitis, with only a few series describing its typical clinical manifestations and prognosis. Here, we present three newly identified patients with anti-AMPAR encephalitis and were followed up for prognostic evaluation. The mean age of the patients was 47 years (range, 32-57).
View Article and Find Full Text PDFNeurol Neuroimmunol Neuroinflamm
September 2025
Neuroimmunology Program, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomédiques August Pi i Sunyer (FRCB-IDIBAPS), University of Barcelona, Spain.
Background And Objectives: Anti-alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid receptor (anti-AMPAR) encephalitis manifests as limbic encephalitis in adults and is often associated with cancer. Although some reports suggest that it may occur in children, the clinical features in this population, as well as the prognostic factors and long-term outcomes in children and adults, are unknown.
Methods: We performed a retrospective, international collaborative study of patients with anti-AMPAR encephalitis.
BMC Psychiatry
July 2025
Department of Neurology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, 260-8677, Japan.
Background: Catatonia is a psychomotor disorder characterized by diverse clinical features, including mutism, stereotypy, posturing, waxy flexibility, and echophenomena. This condition is often observed in patients with anti-N-methyl-D-aspartate receptor (NMDAR) encephalitis, in which impaired glutamatergic transmission through antibody-mediated NMDAR internalization is demonstrated. However, cases of anti-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) encephalitis presenting as catatonia have rarely been reported, and the mechanisms underlying such presentation remain unclear.
View Article and Find Full Text PDFMedicine (Baltimore)
April 2025
Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei, China.
Rationale: Anti-alpha-amino-3-hydroxy-5-methyl-4-isozolipropionic acid receptor (AMPAR) encephalitis is a rare autoimmune encephalitis mediated by anti-AMPAR antibodies produced on the surface of neuronal cells. Anti-AMPAR encephalitis has a variety of clinical manifestations, the common clinical manifestations are characterized by borderline encephalitis, including short-term memory loss, confusion, behavioral abnormalities, and seizures.
Patient Concerns: Here we report a case of anti-AMPAR encephalitis in an adolescent female with aphasia as the first symptom of involuntary limb shaking.
Front Immunol
March 2025
Department of Neurology Medicine, The Second Hospital of Shandong University, Cheeloo College of Medicine of Shandong University, Shandong University, Jinan, China.
Anti-α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor encephalitis is a rare autoimmune disease divided into two subtypes, anti-AMPAR1 encephalitis and anti-AMPAR2 encephalitis, depending on the presence of autoantibodies targeting the GluR1 and GluR2 subunits of the AMPA receptor. The main manifestations are limbic encephalitis, including cognitive impairment, seizures, and psychiatric symptoms. The reported cases of anti-AMPAR encephalitis have grown; however, no research has yet described the clinical characteristics of each subtype.
View Article and Find Full Text PDF