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Conference proceeding
3040 GABA-A encephalitis with excellent clinical outcome following immunotherapy
BMJ neurology open, Vol.6(Suppl 1), p.A23
ANZAN Annual Scientific Meeting 2024 (Adelaide, SA, Australia, 21/05/2024–24/05/2024)
2024
Abstract
Background
GABA-A encephalitis is rare and presents with seizures and altered cognition. MRI demonstrates multifocal non-enhancing, non-diffusion restricting cortical and subcortical FLAIR signal abnormalities, predominantly in temporal lobes. GABA-A cannot be tested in Australia. Most patients have incomplete responses to immunotherapy.
Case
A 47-year-old man presented with 4-weeks of headache, cognitive change, episodic non-sensical speech and synaesthesia (seeing spoken words written). Examination revealed moderate mixed dysphasia and normal cranial nerve, upper and lower limb examinations.
MRI demonstrated multifocal non-enhancing, non-diffusion restricting T2 hyperintense lesions in temporal and parietal lobes. Lumbar puncture was non-inflammatory with negative oligoclonal bands. Serum and CSF GABA-B, NMDA, AMPA, anti-neuronal, VGKC, and serum MOG and GAD65 were negative. Quantiferon Gold was positive, confirming latent tuberculosis, however additional infective testing resulted negative. EEG showed bilateral epileptiform abnormalities and focal seizures. PET demonstrated FDG activity in the fossa of Rosenmullar, with biopsy negative for malignancy.
Despite anti-seizure medications, intravenous immunoglobulin, and isoniazid he developed intractable hiccups, with progressive imaging changes. He improved following intravenous methylprednisolone and Rituximab, but re-presented with impaired hearing and auditory hallucinations, with further imaging progression. He commenced plasma exchange, methylprednisolone (1g weekly for 6-weeks, then 1g fortnightly for 6-weeks) and cyclophosphamide. Biopsy was considered, however GABA-A resulted positive in CSF and serum. Traditionally these cases are difficult to treat, but he has recovered to almost baseline cognition.
Conclusion
We describe a case of GABA-A encephalitis with typical MRI appearances, which was the clue to the underlying antibody, and an excellent clinical response following immunotherapy.
Details
- Title
- 3040 GABA-A encephalitis with excellent clinical outcome following immunotherapy
- Authors/Creators
- Merrilee Needham - Murdoch UniversityAllycia MacDonald - Fiona Stanley HospitalAnna Tierney - Royal Perth HospitalJackson White - Fiona Stanley HospitalKevin O'Connor - Royal Perth HospitalBen McGettigan - Fiona Stanley Hospital
- Publication Details
- BMJ neurology open, Vol.6(Suppl 1), p.A23
- Conference
- ANZAN Annual Scientific Meeting 2024 (Adelaide, SA, Australia, 21/05/2024–24/05/2024)
- Publisher
- BMJ Publishing Group; Adelaide, SA, Australia
- Identifiers
- 991005695148907891
- Copyright
- © 2024 BMJ Publishing Group Ltd & Australian and New Zealand Association of Neurologists.
- Murdoch Affiliation
- Health Futures Institute; Centre for Molecular Medicine and Innovative Therapeutics
- Language
- English
- Resource Type
- Conference proceeding
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